Gas calorimeter

This is a recording gas calorimeter that measures the amount of heat released during combustion of a gas. This is done with a U-shaped tube filled with oil. The ends of this tube end in tanks containing a float. When the gas is burned, the oil becomes warmer in one of the two ends. The other end is kept at room temperature. The heat causes the oil to expand and the float rises. The difference in height of the two floats is drawn with an ink pen on graph paper. The graph paper is rolled off by a special fusee clockwork. This clockwork is driven by a spring and contains a fusee: a conical part with a spiral groove. This ensures that the drive power is kept constant. The end result is that you can read the heat measurement on the graph paper. This gas calorimeter is based on the patent granted to Englishman Chester Beasley.