Constant Volume Air Thermometer

Consists of a polished teakwood stand approx. 750 mm high fitted with a wooden scale reading from 0 to 60 cm x 1 mm & supporting an adjustable mercury reservoir by a metal rod.
A detachable air thermometer bulb about 70 mm diameter connected via three way stop cock to mercury tube with zero index fused inside its upper end. A metal vessel surrounding the bulb supported by detachable metal shelf mounted on insulated asbestos screen. Mounted on a teakwood stand with a deep tray which serves to catch any mercury spilled accidentally from the reservoir. Supplied complete with 1 meter of rubber pressure tubing 10 mm outer diameter & 5 mm bore for connecting the reservoir to the bulb.