Heat of Vaporization of Liquid Hydrochloric Acid. 435 



The actual work done altogether is derived from the charged 

 condenser. This is divided between the circuit and the field 

 in the ratio R : X. 



It may happen, therefore, that if the circumstances of the 

 discharge are such as to make X very large in comparison 

 with R, the ordinary heating-effect may be minimized. Among 

 such causes is frequency, and in this consideration is to be 

 found the true explanation of some of the experiments of 

 M. Nikola Tesla. The energy of the discharges which that 

 physicist encountered was expended in chief part in radiation 

 which his body did not check, and not in current through his 

 body. It is here suggested that the best way to measure 

 radiation would be to measure the defect in the heating of a 

 circuit, taking care to note the P.D. of the condenser at the 

 moment previous to discharge. 



In ordinary sustained oscillations, as derived from a machine, 

 the alternations are not of sufficient frequency to make the 

 effect of X perceptible. Electromotive forces of induction in- 

 volve the period in their denominators, and it is reasonable 

 to suppose that induced magnetic fields do the same; and if 

 the period of the electromagnetic vibrations becomes com- 

 parable with that of light, it is conceivable that mere heating- 

 might vanish, as in the solar spectrum light has less heating- 

 effect than radiation of smaller frequency from the same source. 



XLI. Note on the Heat of Vaporization of Liquid Llydro- 

 chloric Acid. By K. Tsueuta, RigaJcushi, Tokio, Japan*. 



IN the thirtieth volume of the Proceedings of the Royal 

 Society of London Mr. Ansdell gave a full account of 

 a series of experiments on the condensation of hydrochloric 

 acid. At the end of the paper he promises another commu- 

 nication containing his considerations on some thermodyna- 

 mical quantities relating to that gas, but this, so far as I am 

 aware, has never appeared. Although his measurements 

 have often been referred to and used by other physicists, yet 

 some of the deductions that can be made from them appear 

 still left untouched, for instance the heat of vaporization, 

 which forms the subject of this note. 



For the sake of convenience of reference I here reproduce 

 those measurements as contained in the following Table given 

 by Ansdell : — 



* Communicated bv the Author. 



