This is the small rod which slide the weight over the graduation.

US Torsions scale
Pic PH SC 55

US Pharmacy scale

Made by
The Torsions Balance Co, New York

capacity 120 gram
Class A

Wooden case with wood / glass lid.

The black glass cover has two clear areas for
A = The indicator
B = A slider weight on a graduation
( 10 Gram and 15.4 grain ) 

This front wheel take the balance in and out of the weighing position.

Exit to the Start-Frame