VII. On the measurement of the heat produced by compressing liquids and solids

In the year 1885 Messrs. Creelman and Crocket (‘Edinburgh Roy. Soc. Proc.,’ vol. 13. p. 311), under Professor Tait’s supervision, performed a series of experiments on the heat produced by the compression of various substances. Their method was briefly as follows:— For the application of the pressure, the same apparatus which we describe and figure later was used. A thermo-electric junction of insulated nickel and iron wires was fixed between the leather washers and a sufficient length of wire coiled away inside the gun to allow the junction to be drawn out at the top and a specimen attached to it.