PLUMB BOB VINTAGE BRASS ANTIQUE OLD LEVEL TOOL SOLID TIP ROUND 1900S 290 GRAM


A plumb bob, or plummet, is a weight, usually with a pointed tip on the bottom, suspended from a string and used as a vertical reference line, or plumb-line. 
It is a precursor to the spirit level and used to establish a vertical datum.
The instrument has been used since at least the time of ancient Egypt to ensure that constructions are "plumb", or vertical. It is also used in surveying, to establish the nadir with respect to gravity of a point in space. It is used with a variety of instruments (including levels, theodolites, and steel tapes) to set the instrument exactly over a fixed survey marker or to transcribe positions onto the ground for placing a marker.


 
Length Plumb Bob  :  9 cm     =    3 35⁄64 inch



Weight Plumb Bob : 290 Gram´s  



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