Constant Volume Air Thermometer

Consists of a polished teakwood stand approx. 750mm high fitted with 

a wooden scale reading from 0 to 60cm x 1mm & supporting an adjustable mercury reservoir 

by a metal rod. Adetachable air thermometer bulb about 70mm diameter connected via three  way stopcock 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.