Torsion Apparatus/Barton’s Apparatus
A steal frame is mounted on a heavy cast iron base with levelling screws. Upper end of rod (under test) 900mm length and 5mm dia is clamped by a 3-jaw chuck and a jaw clamped into the axis of a torsional drum which can be rotated by putting load in the scale pan passing over to frictionless pullies. Freely sliding three circular scales graduated in single degrees can be clamped at ay position.Three pointers for clamping to the test rod are provided. Complete with three test rods, strings and two scale pans.