Expansion Apparatus Gunther

With two cast end pieces jointed by three nickel plated rods which carry two sliding V supports for a glass jacket with inlet and outlet tubes. One end piece fitted with spherometer reading to 0.005mm, and the other with contact screw. The Glass jacket enclosed both a brass and a copper rod each 500 x 6mm, length x diameter, fitted through corks, a half turn of the jacket changing the rod in contact with the spherometer. A thermometer can be attached to either of the rods by rubber bands. Brass terminals are fitted to the apparatus so that an electrical circuit can be made through either rod to indicate the moment of contact of centre tube and spherometer. Overall dimensions 600 x 125 x 150mm.