This Hypsometer consists of a double-walled copper cylinder measuring 34 x 6 cm, mounted on a steam boiler. It is fitted with a thermometer tubulure at the top, a side outlet draining tube, and a glass manometer mounted in a tubulure with rubber bungs. The apparatus is used for the determination of the upper fixed points of thermometers and for measuring boiling points at barometric pressures other than standard atmospheric pressure. The double-walled construction ensures uniform steam distribution around the thermometer for accurate readings.