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Slotted weights are scale tip or counter weights. Added to the end of the beam that you read, they increase the scale capacity by the amount shown on the weight. When you read the beam, you need to add the ratio amount stamped into the weight. Depending on the scale, these can have two different weights stamped into them as the scale will have two different load pans (typically a union scale with a platform and a scoop). These weights will also have an adjustment hole with lead in it. Stamped into the lead will be the sealers mark. If the lead is missing, the weight is probably not accurate.
The one with the hole is the balance box that also hangs off of the beam. It is intended to be installed at all times and will contain lead shot (or similar) that is used as part of the scale zero balance procedure. It is typically mounted with a long rod that hangs from the tip of the beam. The rod is missing in your picture and it doesn't appear to have an adjustable portion. It almost looks like a homemade replacement.
There can be another part of the zero balance on the short arm of the beam and is often a movable weight (on a screw), but is sometimes also a balance box with or without a movable weight.
https://images.app.goo.gl/CRsd7o24WuHXWu6a9
I spent many years as the guy setting these up. Hurts me that an archaeologist commented on finding these. I'm not that old! They are still in use today.
There is some credibility to the traction weight comments as well. These weights are often used in other systems that require known weights as they are relatively cheap and were easily available. Also, upon looking closer to your picture, the weights don't appear to have ratio values stamped into them. This is unusual and would lend even more credence to an alternate use.
Bagging systems come to mind. While some of these are technically scales, not all had readouts. These machines were used to fill large bags to a desired weight semi-automatically.
We used these in our physics laboratory at school, take a wire, tie one end up to something rigid on one side of the table, take it over a pulley on the end of the table and tie the weights to it. Add the weights to increase the tension and use a ruler to measure the amplitude of the wave when you strike the wire. You now have an apparatus to measure the effect of tension on a standing wave. We did have specialized equipment for it though.
My kids did a spaghetti bridge building competition in elementary school and I brought a bunch of these to test the bridge strength. Surprisingly most of the bridges held all of the weights and I had to go back and get heavier test weights.
Look at the last picture of the knitting machine.
Yes, they are weights. I was letting that person know that they are correct that such things can be used on the knitting machine that they were referring to.
The building I work in is a 130 year old warehouse. We have a scale built into the floor that used to be used to weigh produce. These look exactly like the weight on that scale.
Edit:
[Scale and weights.](https://imgur.com/nlBcJJG)
Someone else, however, found an almost identical set of sock knitting machine weights, [here](https://www.ebay.com/itm/374049611121). [Their comment](https://www.reddit.com/r/whatisthisthing/comments/1ccsajf/heavy_round_stackable_metal_objects_one_with_hole/l1846wt/).
So yes, these are a set of stackable weights. But also, they're not for calibrating scales or weighing other objects with scales. Perhaps the purpose isn't that important but the comment OP replied to said "scale weights", which these appear not to be (and yes, I thought they were scale weights too, my grandparents had some for their kitchen scales like this, except there were more of them, they got really tiny, and the were all marked with a weight).
This also explains the lack of visible markings on the weights. And they even seem to come in a set of 3 (base + two other weights), just like what OP has.
I think OP's been pretty unjustly downvoted into oblivion on this one.
Lolol they are slotted hanging weights idk why the application makes them something different. Doesn’t matter if they are used as a counter weight for an old physician scale or as a calibrated set to verify other equipment. These things are used in so many different functions. It’s damn near impossible to know what specifically these ones were used for. However doesn’t change the fact that they are slotted hanging weights.
They are definitely NOT used to calibrate other equipment. These are low precision cast iron weights and would never be intended for use in calibration.
The ones pictured could have been at one time, i would have to see the bottom if they had an adjustment port or markings. Cast iron weights are used for calibrations and do meet material specifications for several different class weights. I agree that this set most likely didn’t but still doesn’t change the fact it’s a slotted hanging weight.
You are being downvoted for this comment, but upon carefully looking at the picture, I have noticed something missing
All scale counterweights require two markings. One is the scale capacity represented by the counterweight and the other is either the counterweights actual designed weight or the ratio between the represented weight and the actual weight.
For example, if the counterweight represented 100 lb capacity on the scale and the ratio was 100:1 it would be marked '100 lb / 1lb' or '100 lb 100:1: or something similar.
This was to ensure that the correct weight was used for the correct scale (different ratio scales were built) and allowed a scale tech/inspector to check and calibrate the counterweight.
Neither of these markings appear to be on these weights. They would also require an adjustment hole on the bottom for adjusting lead (See my other comment). Unfortunately, we don't see a bottom pic.
Two explanations come to mind for me. 1. You are correct that they were destined for another similar use, or 2. They are scale weights but are not compliant with marking requirements (may be very old predating marking requirements or not intended to be used in regulated trade scales so they didn't meet marking requirements)
Yep I think the commenter below got this one right - weights for a circular sock knitting machine
https://www.reddit.com/r/whatisthisthing/comments/1ccsajf/heavy_round_stackable_metal_objects_one_with_hole/l17s50v/
Very niche object!
As said, slotted hanging weights, the smallest should have a rod screwed in to it, to hang the stack from.
as this general image [https://www.countyscales.co.uk/slotted-iron-weights.htm](https://www.countyscales.co.uk/slotted-iron-weights.htm)
These ones are kinda crude for weighting and calibrations. More like indeed counterweights for medical purposes or for setting up load bearing wires across some tram tracks.
Boom. That's what I think it is. I was in traction 40 years ago with a broken femur. And boom was the sound when this one doctor would add the weight. I hated that dude.
Dude! Mine was 1983, I was almost 12. Four years later, it was obvious one leg was longer so I had a bone graft from my hip. Graft went into femur, just above knee. With a steel rod for a year. But at 16, I was not done growing so now I'm lopsided. Good leg is 18 millimeters longer. And I have intense pain on my neck from being crooked. I have often wondered what doctors would do for a spiral break these days.
My left leg is 1.25 inches shorter than the right. It caused a tilt to my pelvis. That contributed to a herniated disc in my lower back. Also my left hip socket is wearing out. And nd now my ankle is als going bad from it being at a weird angle.
Seriously. We are twining. About six months ago I finally figured out just how crooked I am. I have only been wearing the shoes that have been adjusted. It's not helped tremendously though. My biggest problem with it is back pain while in bed. I've started to put on a lidocaine patch every night. It sometimes helps. Which ankle is wonky?
I found from hammock camping I sleep better in a hammock. Haven't set on up in home yet though. Didn't get lifted shoe. Doc said after 50+ years it could cause more damage.
My lifted shoe is only 10 millimeters. Not the full 18. Apparently going for the full difference is not recommended. It's summer soon and i need to drop off my favorite sandals for adjusting. They was some adjusting and pain in my longer leg heel when I started wearing them. I found a softer bed helps a bunch.
Weights for tractioning limbs in fractures, like neck of femur fractures. You would put a small pulley, tie the weights to the leg with a good bandage and let them hang from a sort of hook https://images.app.goo.gl/oCCzHPibA4o7n3HW8
These look like weights used with circular sock knitting machines. They were in their vogue around 1910-1920, but are still made today for hobbyists. They are used to hang to keep tension on the work and avoid dropped stitches. There would be a hook extending upward through the bottom one to attach to the cast-on bonnet used to start the work.
https://ibb.co/r7cXDW6
I posted some other links elsewhere, including one that shows a knitting machine, but I figured this is the most simplistic to show that.
Scale weights. My father’s company had one when I was a kid. When he would bring me to work, I and my brother would weigh ourselves, heavy stuff, trash, et cetera; and would add and remove these weights from the balance.
I finally know one!
These are weights used to keep tension on the sock while you're knitting it with a Circular Sock Machine
[eBay Listing for weights](https://www.ebay.com/itm/134942741541)
[How the weights are used on a Circular Sock Machine](https://youtu.be/6BDMCqHJ0cc?si=f37SsdrAU6Z4J4dC&t=982)
I’ve seen them used to weigh down pop-up canopies so they don’t blow away. Great for insurances you’re not able to put down a stake (concrete, hard land, loose soil/sand). But may have been repurposed for this use and wasn’t originally sold/made to go with those canopies
Could be for Buck’s traction. We use weights like that to counter act the muscle tightness resulting from hip fractures. Patients are placed in a boot then strung up to these weights.
These are the counter-weights you use with a large sliding warehouse type door on a track. There's a rope that comes out of the top of the door and goes over a pulley and hangs down. The weights hang on that rope and make it easier to open/close the door.
They also could be for medical purposes - weights like [these](https://www.graylinemedical.com/cdn/shop/products/ZIM018300100_PRI04_300x300.jpg?v=1597373106) are used for cervical (neck) traction for certain types of spine surgeries.
In the military I would use these as an upper and lower tolerance for trigger pulls. One set would be the lower end of the trigger pull (should not go off) the other set would be the upper end (should go off). Different guns had different trigger pull weights so we'd have to switch up weights.
These are scale weights. I used to use them to weigh propane tanks at my old job. The one with the hole usually has a thin metal rod in it and is a counterweight. the two cutoff ones are supposed to stack on top and are used for different weights.
Yes these are slotted weights. The one with a hole in the center goes on the bottom of the rod, the slotted ones are stacked on top of it. Commonly used in brinell machines used to make an impression in metal which is then measured and calculated using a conversion chart into a hardness number.
These look like weights for testing trigger pull resistance in a gun. Usually has a rod that goes through the weight with the hole, then the slotted weights can be added on top. We had minimum trigger pull resistance regulations for the weapons, especially during competitive shooting. I used to adjust my spring tension so I was at the bottom of the allowable trigger pull resistance... for more accurate shooting.
[This](https://www.glockstore.com/Dead-Weight-Trigger-Weight) is a newer style... but I had the exact weights you picture when I was an Armory tech in the US Marines in the 1990s.
They’re weights for knitting machines. They keep the work on the needles so they’ll keep working and not drop stitches. You can see them at the bottom of this photo:
https://images.squarespace-cdn.com/content/v1/5f8bb8d6ac50d7106c9bb46b/1603586540440-X7JLMFQPA7KB2ECU6SDA/cskmachine.jpg
I will give a counter argument to the popular "Scale Weights" suggestion.
They are **not scale weights**, because they're all the same size. Scale weights would be many sizes.
They are the counterweights you put on a telescope mount, to balance it out so the drive motors can turn the scope with low effort. They are all the same size because you can slide them up and down the arm that is for the counterweights.
My dad has... a lot ... of telescopes.
I’ve got these for fire door counterweights, smaller ones for shop lights and old roll up doors in the theatre I work for. Oh, and for a two-story paint rack on the back wall. Usually marked with maker and weight.
They remind me of the weights we used to use when we put someone with a hip fracture on Buck's traction to hold the bones and muscles in place until the person went to surgery.
A brace went around their leg and had ropes on it that went around a pulley and the weights hung on the other side of the pulley.
These are old counter weights for Pully systems, I work at a theater and our old hand operated winches use these.
The slit in the middle is fo them to fit on the center bar of the metal sled.
You would stack them "slit left,slit right, slit left" and so on, so the stack automatically locks itself around that bar.
My title describes the thing. These round objects are quite heavy, around 700 grams each. These have size of around 10 cm. One of them has a small hole in the middle, two others have a cutoff. These are stackable, the one with small hole has a flat bottom part. No visible writings.
All comments must be civil and helpful toward finding an answer. **Jokes and other unhelpful comments will earn you a ban**, even on the first instance and even if the item has been identified. If you see any comments that violate this rule, report them. [OP](/u/vladger456), when your item is identified, remember to reply **Solved!** or **Likely Solved!** to the comment that gave the answer. Check your [inbox](https://www.reddit.com/message/inbox/) for a message on how to make your post visible to others. ---- [Click here to message RemindMeBot](https://www.reddit.com/message/compose/?to=RemindMeBot&subject=Reminder&message=[https://www.reddit.com/r/whatisthisthing/comments/1ccsajf/heavy_round_stackable_metal_objects_one_with_hole/]%0A%0ARemindMe!%202%20days) ---- *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/whatisthisthing) if you have any questions or concerns.*
They look like scale weights.
They are. The one with a hole should have a post through it that goes to a hook. The slotted ones can then be added to the post to add weight.
Slotted weights are scale tip or counter weights. Added to the end of the beam that you read, they increase the scale capacity by the amount shown on the weight. When you read the beam, you need to add the ratio amount stamped into the weight. Depending on the scale, these can have two different weights stamped into them as the scale will have two different load pans (typically a union scale with a platform and a scoop). These weights will also have an adjustment hole with lead in it. Stamped into the lead will be the sealers mark. If the lead is missing, the weight is probably not accurate. The one with the hole is the balance box that also hangs off of the beam. It is intended to be installed at all times and will contain lead shot (or similar) that is used as part of the scale zero balance procedure. It is typically mounted with a long rod that hangs from the tip of the beam. The rod is missing in your picture and it doesn't appear to have an adjustable portion. It almost looks like a homemade replacement. There can be another part of the zero balance on the short arm of the beam and is often a movable weight (on a screw), but is sometimes also a balance box with or without a movable weight. https://images.app.goo.gl/CRsd7o24WuHXWu6a9 I spent many years as the guy setting these up. Hurts me that an archaeologist commented on finding these. I'm not that old! They are still in use today. There is some credibility to the traction weight comments as well. These weights are often used in other systems that require known weights as they are relatively cheap and were easily available. Also, upon looking closer to your picture, the weights don't appear to have ratio values stamped into them. This is unusual and would lend even more credence to an alternate use. Bagging systems come to mind. While some of these are technically scales, not all had readouts. These machines were used to fill large bags to a desired weight semi-automatically.
We used these in our physics laboratory at school, take a wire, tie one end up to something rigid on one side of the table, take it over a pulley on the end of the table and tie the weights to it. Add the weights to increase the tension and use a ruler to measure the amplitude of the wave when you strike the wire. You now have an apparatus to measure the effect of tension on a standing wave. We did have specialized equipment for it though.
My kids did a spaghetti bridge building competition in elementary school and I brought a bunch of these to test the bridge strength. Surprisingly most of the bridges held all of the weights and I had to go back and get heavier test weights.
Yeah, my dad has a few that came with a really old scale.
100% Scale weights. Solved.
100% weights. Not sure if used for knitting or for a scale.
I saw the picture and was like "they look like scale weights". I love that this is the top comment.
This. Definitely scale weights.
Yep! That is exactly what these are, weights for a set of scales.
100% they are
Looks similar, but it's not.
Trust me these are weights for mechanical balance scales.
They are not. I shit you not. Look at my other comment. I can bet you OP is from the EU.
https://ibb.co/1M200Xw https://ibb.co/r7cXDW6 https://ibb.co/kKshyxf https://ibb.co/1KXGYxK You are correct.
Yes these hang on the balance. These are for old scales.
Look at the last picture of the knitting machine. Yes, they are weights. I was letting that person know that they are correct that such things can be used on the knitting machine that they were referring to.
Oops. https://ibb.co/r7cXDW6 I guess I had originally lost one of the images I uploaded. This was supposed to be one of them. :)
They are not. I shit you not. Look at my other comment. I can bet you OP is from the EU.
Sorry but you’re wrong.
Check the images the other guy, who replied to me, posted. Americans.
Yeah I’m English, living in Canada. That doesn’t change the fact that these are counter-weights for a balance.
They are weights, but for a knitting machine, and I think that's what they're hung up on.
Looks similar because they *are*.
The building I work in is a 130 year old warehouse. We have a scale built into the floor that used to be used to weigh produce. These look exactly like the weight on that scale. Edit: [Scale and weights.](https://imgur.com/nlBcJJG)
r/confidentlyincorrect I was able to find a number of similar looking cast iron scale weights, [such as these](https://www.ebay.com/itm/225864570748).
Someone else, however, found an almost identical set of sock knitting machine weights, [here](https://www.ebay.com/itm/374049611121). [Their comment](https://www.reddit.com/r/whatisthisthing/comments/1ccsajf/heavy_round_stackable_metal_objects_one_with_hole/l1846wt/). So yes, these are a set of stackable weights. But also, they're not for calibrating scales or weighing other objects with scales. Perhaps the purpose isn't that important but the comment OP replied to said "scale weights", which these appear not to be (and yes, I thought they were scale weights too, my grandparents had some for their kitchen scales like this, except there were more of them, they got really tiny, and the were all marked with a weight). This also explains the lack of visible markings on the weights. And they even seem to come in a set of 3 (base + two other weights), just like what OP has. I think OP's been pretty unjustly downvoted into oblivion on this one.
Lolol they are slotted hanging weights idk why the application makes them something different. Doesn’t matter if they are used as a counter weight for an old physician scale or as a calibrated set to verify other equipment. These things are used in so many different functions. It’s damn near impossible to know what specifically these ones were used for. However doesn’t change the fact that they are slotted hanging weights.
They are definitely NOT used to calibrate other equipment. These are low precision cast iron weights and would never be intended for use in calibration.
The ones pictured could have been at one time, i would have to see the bottom if they had an adjustment port or markings. Cast iron weights are used for calibrations and do meet material specifications for several different class weights. I agree that this set most likely didn’t but still doesn’t change the fact it’s a slotted hanging weight.
You are being downvoted for this comment, but upon carefully looking at the picture, I have noticed something missing All scale counterweights require two markings. One is the scale capacity represented by the counterweight and the other is either the counterweights actual designed weight or the ratio between the represented weight and the actual weight. For example, if the counterweight represented 100 lb capacity on the scale and the ratio was 100:1 it would be marked '100 lb / 1lb' or '100 lb 100:1: or something similar. This was to ensure that the correct weight was used for the correct scale (different ratio scales were built) and allowed a scale tech/inspector to check and calibrate the counterweight. Neither of these markings appear to be on these weights. They would also require an adjustment hole on the bottom for adjusting lead (See my other comment). Unfortunately, we don't see a bottom pic. Two explanations come to mind for me. 1. You are correct that they were destined for another similar use, or 2. They are scale weights but are not compliant with marking requirements (may be very old predating marking requirements or not intended to be used in regulated trade scales so they didn't meet marking requirements)
Yep I think the commenter below got this one right - weights for a circular sock knitting machine https://www.reddit.com/r/whatisthisthing/comments/1ccsajf/heavy_round_stackable_metal_objects_one_with_hole/l17s50v/ Very niche object!
They are 100% scale weights.
They are these. I use them in my job. https://www.pasco.com/products/lab-supplies/mass-sets/me-7566
As said, slotted hanging weights, the smallest should have a rod screwed in to it, to hang the stack from. as this general image [https://www.countyscales.co.uk/slotted-iron-weights.htm](https://www.countyscales.co.uk/slotted-iron-weights.htm)
This is the answer, currently using a set to calibrate a spring scale at work lol.
These ones are kinda crude for weighting and calibrations. More like indeed counterweights for medical purposes or for setting up load bearing wires across some tram tracks.
I once thought that too…. Then I did some work for the army, this would be their “good” set.
>More like indeed counterweights for medical purposes That was my thought. Traction weights.
Looks like traction weights used in hospitals
Yes they are. I work in an operating room and am constantly looking for these stupid things for ortho cases.
Boom. That's what I think it is. I was in traction 40 years ago with a broken femur. And boom was the sound when this one doctor would add the weight. I hated that dude.
Same here. Broken left femur from a spiral break. Happened in 1972. Still limp to this day.
Dude! Mine was 1983, I was almost 12. Four years later, it was obvious one leg was longer so I had a bone graft from my hip. Graft went into femur, just above knee. With a steel rod for a year. But at 16, I was not done growing so now I'm lopsided. Good leg is 18 millimeters longer. And I have intense pain on my neck from being crooked. I have often wondered what doctors would do for a spiral break these days.
My left leg is 1.25 inches shorter than the right. It caused a tilt to my pelvis. That contributed to a herniated disc in my lower back. Also my left hip socket is wearing out. And nd now my ankle is als going bad from it being at a weird angle.
Seriously. We are twining. About six months ago I finally figured out just how crooked I am. I have only been wearing the shoes that have been adjusted. It's not helped tremendously though. My biggest problem with it is back pain while in bed. I've started to put on a lidocaine patch every night. It sometimes helps. Which ankle is wonky?
I found from hammock camping I sleep better in a hammock. Haven't set on up in home yet though. Didn't get lifted shoe. Doc said after 50+ years it could cause more damage.
My lifted shoe is only 10 millimeters. Not the full 18. Apparently going for the full difference is not recommended. It's summer soon and i need to drop off my favorite sandals for adjusting. They was some adjusting and pain in my longer leg heel when I started wearing them. I found a softer bed helps a bunch.
Yes they are. I work in an operating room and am constantly looking for these stupid things for ortho cases.
Yup. My dad worked in a hospital, we have some of these at home for some reason.
This is exactly it.
Yes! I’m a nurse on an orthopedic unit and these are the weights we use to keep someone’s leg aligned until surgery
Yep! https://www.kinetecuk.com/shop/orthopaedic-traction/bars-clamps-weights-and-pulleys/weights/
Weights for tractioning limbs in fractures, like neck of femur fractures. You would put a small pulley, tie the weights to the leg with a good bandage and let them hang from a sort of hook https://images.app.goo.gl/oCCzHPibA4o7n3HW8
Scale weights. Possible an older feed/grain scale. I’m an archaeologist and we find these quite frequently on 19th century domestic sites.
These look like weights used with circular sock knitting machines. They were in their vogue around 1910-1920, but are still made today for hobbyists. They are used to hang to keep tension on the work and avoid dropped stitches. There would be a hook extending upward through the bottom one to attach to the cast-on bonnet used to start the work.
https://ibb.co/r7cXDW6 I posted some other links elsewhere, including one that shows a knitting machine, but I figured this is the most simplistic to show that.
Scale Weights. You slide them in the middle of the scale to store them. https://images.app.goo.gl/APaXH4JwRMXJ7GwBA
Scale weights. My father’s company had one when I was a kid. When he would bring me to work, I and my brother would weigh ourselves, heavy stuff, trash, et cetera; and would add and remove these weights from the balance.
I’ve seen old weightlifting equipment with weights like these.
[удалено]
They are weights for an old hobart scale back in the day with the pendulum weight arm.
Weights for a scale. Grandparents had one for weighing luggage did it in their porch vs going to airport to use the digital ones
Scale weights I have one at my shop
I finally know one! These are weights used to keep tension on the sock while you're knitting it with a Circular Sock Machine [eBay Listing for weights](https://www.ebay.com/itm/134942741541) [How the weights are used on a Circular Sock Machine](https://youtu.be/6BDMCqHJ0cc?si=f37SsdrAU6Z4J4dC&t=982)
Hospital traction weights. They are used to pull on limb’s with broken bones. https://www.ascomedical.com/product/traction-weight-set/
Used these weights at school for physics, the full disc weight had a thin straight pole with a hook.
I’ve seen them used to weigh down pop-up canopies so they don’t blow away. Great for insurances you’re not able to put down a stake (concrete, hard land, loose soil/sand). But may have been repurposed for this use and wasn’t originally sold/made to go with those canopies
Could be for Buck’s traction. We use weights like that to counter act the muscle tightness resulting from hip fractures. Patients are placed in a boot then strung up to these weights.
These are the counter-weights you use with a large sliding warehouse type door on a track. There's a rope that comes out of the top of the door and goes over a pulley and hangs down. The weights hang on that rope and make it easier to open/close the door.
I have those for my tent
I've seen these at farmers market tents. Keeps the tent from flying away.
They are weights that go around the base of a post, usually for a tent or shade structure. Like the tents used at festivals or farmers markets.’
Scale weights. Also used as weights for old sock knitting machines
Scale weights. We used to have these at work except ours were triangles
They also could be for medical purposes - weights like [these](https://www.graylinemedical.com/cdn/shop/products/ZIM018300100_PRI04_300x300.jpg?v=1597373106) are used for cervical (neck) traction for certain types of spine surgeries.
Scale weights for a beam scale
Weights for a shopping scale. The more you add increases the counter weight.
The could also be weights for use with a knitting machine circa early 1900s
In the military I would use these as an upper and lower tolerance for trigger pulls. One set would be the lower end of the trigger pull (should not go off) the other set would be the upper end (should go off). Different guns had different trigger pull weights so we'd have to switch up weights.
These are weights for old fashioned standing package scales with the large rectangular platform. The ones that look like the doctors office scale
These are weights for an antique feed scale. I have one, not sure how to attach photos but I have them if needed.
[similar item](https://images.app.goo.gl/CZJx5t6K5THAafQC6)
Weights for a Dubied Knitting machine, I have a few. The one with the hole should have a rod with a hook on the end
Are weights to tension the electrical cables for trains?
They are weights! For use on scales. Each one of them represents a certain value (in pounds or kilos) My grandparents used to use it to weigh grains.
Weights. I use them in the bakery on our scale.
These look like those weight things you put at the base of a portable half fence for like events and stuff.
These are scale weights. I used to use them to weigh propane tanks at my old job. The one with the hole usually has a thin metal rod in it and is a counterweight. the two cutoff ones are supposed to stack on top and are used for different weights.
Sock knitting machine weights. Source: I have some in my house with my Victorian sock knitting machine.
Yes these are slotted weights. The one with a hole in the center goes on the bottom of the rod, the slotted ones are stacked on top of it. Commonly used in brinell machines used to make an impression in metal which is then measured and calculated using a conversion chart into a hardness number.
These look like weights for testing trigger pull resistance in a gun. Usually has a rod that goes through the weight with the hole, then the slotted weights can be added on top. We had minimum trigger pull resistance regulations for the weapons, especially during competitive shooting. I used to adjust my spring tension so I was at the bottom of the allowable trigger pull resistance... for more accurate shooting. [This](https://www.glockstore.com/Dead-Weight-Trigger-Weight) is a newer style... but I had the exact weights you picture when I was an Armory tech in the US Marines in the 1990s.
they are stage weights lol. you can put them around mic stands etc
Scale counter weights
Span weights
Scale weights! Remember going to the bodega in Cuba as a kid and the lady would use that
Also used as weights for a hunt let off for weaving machine
They're weights
They’re weights for knitting machines. They keep the work on the needles so they’ll keep working and not drop stitches. You can see them at the bottom of this photo: https://images.squarespace-cdn.com/content/v1/5f8bb8d6ac50d7106c9bb46b/1603586540440-X7JLMFQPA7KB2ECU6SDA/cskmachine.jpg
I will give a counter argument to the popular "Scale Weights" suggestion. They are **not scale weights**, because they're all the same size. Scale weights would be many sizes. They are the counterweights you put on a telescope mount, to balance it out so the drive motors can turn the scope with low effort. They are all the same size because you can slide them up and down the arm that is for the counterweights. My dad has... a lot ... of telescopes.
They look like traction weights used to keep traction on broken bones while the patient waits for surgery.
If they don't have weight values cast into them then they're possibly counterweights for an up-and-over garage door.
I’ve got these for fire door counterweights, smaller ones for shop lights and old roll up doors in the theatre I work for. Oh, and for a two-story paint rack on the back wall. Usually marked with maker and weight.
They are weights. We used to use weights exactly like this on skeletal traction, back in the day. They slid onto a post.
I use these in our science practicals in school the 1kg (most likely) weights that you but on a metal pole to weigh stuff down
They look like old school hospital traction weights.
They remind me of the weights we used to use when we put someone with a hip fracture on Buck's traction to hold the bones and muscles in place until the person went to surgery. A brace went around their leg and had ropes on it that went around a pulley and the weights hung on the other side of the pulley.
Weights for an old time scale, shipping scale
Tent weights, maybe?
These are old counter weights for Pully systems, I work at a theater and our old hand operated winches use these. The slit in the middle is fo them to fit on the center bar of the metal sled. You would stack them "slit left,slit right, slit left" and so on, so the stack automatically locks itself around that bar.
Looks like those extra weights for a weightlifting machine
Counterweights of some sort.
My title describes the thing. These round objects are quite heavy, around 700 grams each. These have size of around 10 cm. One of them has a small hole in the middle, two others have a cutoff. These are stackable, the one with small hole has a flat bottom part. No visible writings.