For determining maximum density of water, made of G.I. Sheet cylinder 50mm dia x 300mm height mounted on a base having 2 tabulators for thermometers, with a gallery of 60mm x 150mm for placing mixture of ice and salt. The respective temperatures of water at the top and bottom of the inner cylindrical vessel are measured over a period as the water cools. Complete with bungs and thermometers.

A casted brass gauge with wooden handle, sliding fit over ends of bar and with hole 12.5mm bore in both arms, and a mild steel bar 110 x 12.5mm. with wooden handle.