Unusual plumb bob with reel
#12
(11-02-2016, 06:46 PM)knockknock Wrote: I don't know if this was ever made, but your plumb bob is real close:

http://www.google.com/patents/US2713211

2 Claims. (Cl. 33-216) This invention relates to a centering device particularly adapted for use in combination with the frame or chassis of a motor vehicle, and in particular a weight in the form of a plumb-bob having a pulley block on the upper end and a point extended from the lower end whereby with the pulley positioned to travel on a cord suspended with slack therein between two points the weight of the device will cause the pulley to travel to a point substantially midway between the two points from which the cord is suspended.

It will only find the center if suspended between two points of equal height.
Still Learning,

Allan Hill
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