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276145 | Matthew Groves <grovesthegrey@g...> | 2022‑08‑13 | Pricing plumb bobs. Impossible task? |
So the friend’s collection that I’m selling has a tub o plumb bobs. How the heck do you price em? https://share.icloud.com/photos/014weepI_KjNQEVNTzxTmoLIw Matthew Groves Springfield, MO |
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276150 | the_tinker <tinker@z...> | 2022‑08‑15 | Re: Pricing plumb bobs. Impossible task? |
Mathew, Can't help much with pricing, I see those old bobs high and low. One bit of advise though - more than likely some of them are full of Mercury. Some folks will recoil in horror but the knowledgeable ones will pay your price for an old mercury filled plumb bob. On a side note, my Dad used to tell me that part of he and his friends routine for getting duded up for a Friday night on the town was to rub mercury on all the silver coins in your pocket to shine them up. He lived to 89 and was active to the end. -JP |
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276151 | Matthew Groves <grovesthegrey@g...> | 2022‑08‑15 | Re: Pricing plumb bobs. Impossible task? |
JP, I know how to spin an egg to discover if it’s hard boiled or raw, but is there a trick to knowing which bobs are filled? Matthew Groves Springfield, MO |
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276154 | Kirk Eppler | 2022‑08‑15 | Re: Pricing plumb bobs. Impossible task? |
The density will be higher. Figure out the volume and weight of a normal one (like a General), then gather the relative heft of others, calculate the density of it, should be much higher. There are rumors that the mercury is supposed to move to dampen the swing, but Starrett etc never made that claim, just higher density. Mercury is 13.59 grams per cubic centimetre Steel is about 7.9 So if the whole thing was mercury, would weigh almost twice as much, but would be hard to get a string around. So guess at 30 - 50% higher weight for the same sized plumb. This says even less, 25% for the same size https://archive.org/details/StarrettToolsCatalogNo25/page/n64/mode/1up Kirk in Half Moon Bay, still looking for hewing hatchets in the mess On Sun, Aug 14, 2022 at 7:33 PM Matthew Groves |
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