A friend was given this mystery object, but has no idea what it is or what it was used for. He brought it to the ME club last night, and nobody could shed any light on it or its use either.
Its about 10" long and lives in a fitted wooden box. There is a corroded 1/4" (?) ball that fits into the recess at the end, at the bottom of which is a small hole that looks as if it has some sort of thin oil in it. There is no scale or other markings associated with the indicator that is apparent in the photo.
Any ideas?



Edited By Gary Wooding on 15/02/2019 08:19:59