Constant Volume Air Thermometer (HT-1575)

Comprises a detachable air thermometer bulb 50mm dia approx. connected to the mercury tube with 0 mark through three way stop cock. Reservoir tube slides on vertical rod along side 50 cm x 1 mm scale. Brass vessel is supported on detachable shelf for immersion of bulb. Whole apparatus is mounted on wooden stand with base able to collect mercury, supplied with pressure tube but without mercury.