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
wrote:
> 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?
>
>
--
Kirk Eppler in Half Moon Bay, CA
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