Vintage Starret Mercury Filled Plumb Bob #87

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Your veiwing and antique tool it does have some damage to cap but still will hang with original silk threadwhich it comes with. Slender, mercury filled bob with a notch on the body to allow the cord to be wrapped around the body and be attached to the center. Produced by Starrett as their No 87 Plumb Bob. The 6" model is 14.5 oz in steel,When you shake it, you see that the mercury compartment is not full. Is this normal?? part of the dampening system//MERCURY PLUMB BOB. This, in our judgment, is altogether the finest Plumb Bob ever placed upon the market. It is made of steel, bored out and filled with mercury or quick silver. Mercury being from 60 to 70 per cent heavier than brass or steel, it makes the Bob unusually heavy In proportion to its size, and the center of gravity low The comparatively' small diameters allow it to be used close to corners and walls, and render it less easily affected by drafts of air The points are hardened, and the bodies and points are ground. These Plumb Bobs are nickel plated, and each is furnished with a braided silk line.As a means of comparison, we might say that the No. 3 Lamp Plumb Bob ( Fig. 951) measures 61 inch in length ; the No. 6, 7# inch In length.

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