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Chapter 11 Plumb Bobs
Using a Plumb Bob

Tools And Their Uses - Hand tools and what they are used for
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TM 9-243 TYPES  AND  USES PLUMB BOBS A  plumb  bob  is  a  precision  instrument  used  to  establish a true vertical transfer and line-up reference point, and to  take  readings  or  soundings  in  tanks  and  voids.  Plumb bobs are used by carpenters, surveyors and mainte- nance technicians. SURVEYOR'S   POLISHED   BRASS The surveyor’s brass plumb bob may be either a spool type  (A)  or  an  adjustable  cap  type  (B).  Both  types  have replaceable steel points for increased accuracy. The adjustable cap allows the operator to make minor cor- rections to height and rotation to make sure the bob hangs  straight.  The  surveyor’s  brass  plumb  bob  comes with a minimum of 7 feet of nylon, silk or linen cord. It comes in 6, 8, 10, and 16 ounce sizes. The heavier plumb bobs are better for use in windy areas. SOLID    STEEL The solid steel plumb bob (A) may have a machined integral head, body, and point. It may have just a remov- able head (B), or a removable head and a replaceable point  (C).  It  may  be  round  or  hexagonal  in  shape  and  it comes in 3, 8, and 12 ounce sizes. Cord for the solid steel bobs must be obtained from a separate source. This type plumb bob is used when extreme accuracy is not required. 11-2







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