Comprising two iron casted stand of 180mm height joined by two chrome plated rods, with an expansion rod, length 380mm, fixed on one stand and resting on a Friction Pointer placed at the other. With graduated scale 0-90° with 3 expansion bars of Iron, Aluminium and Brass.

The investigation of rod is measured by a micrometer screw. The brass tube is 50cms x 2.5cm C.P. With inlet and outlet tubes for steam and opening for thermometer reading to 1°x 110°C. The binding posts are provided on the supports for connecting a bell, buzzer or galvanometer for indicating the exact point of contact of the screw. Provided with three rods of brass, iron and aluminium without belland battery.