Comprising a blackened hollow hemisphere about 25
cm dia, fitted in a wooden board lines with tin, and a steam chamber above the
hemisphere to measure them an uniform temperature by passing steam through it
recorded by two thermometers- Heavy silver disc soldered a bottom to copper-
constantan thermocouple housed in ebonite tube with lid engraved on ebonite
tube are disc constant's mass and area complete with one extra similar
thermocouple for calibration is supplied.
