94 Dr. Hari\'} Dejiagralor and Calonmotor. 



PHYSICS AND CHEMISTRY, MECHANICS AND THE 

 ARTS. ' 



Art. XII. — Correspondence betioeeji Robert Hare, M. D. 



Professor of Chemistry ^-c. in the Medical Department of 

 the Universitif of Pennsi/lvania, and the Editor^ on the sub- 

 ject o/'Uk. IIark's Ca/orinwtor and Defagrator, and the 

 phenomena produced by the7n. 



INTRODUCTORY REMARKS. 



It may be remembered, by the readers of this Journal, that 

 in the letter aUuded to below by Dr. Hare, (see p. 201, vol. 

 4.) the editor, after relating the experiments which he had 

 performed with the Detlagrator, states that he had discov- 

 ered a very unexpected and surprising incompatibility be- 

 tween the Dollagrator and the common galvanic battery. — 

 On connecting an instrument of the latter description, con- 

 sisting of six hundred and twenty pairs, of four and six inch 

 plates, in full activity, with the Deflagrator of eighty coils 

 also in great power, both instruments were completely par- 

 alysed : this was constantly the fact however they were 

 connected, but, on being separated, each instrument instant- 

 ly recovered its energy. Dr. Hare's first letter relates 

 to this subject. 



Letter 1. — From Dr. Hare, on the incompatibility of 

 the above instruments, and the common galvanic Batteries 

 when used in connexion. 



Philadelphia, J\fovember 5, 1821. 



My Dear Sir, 



I have received your letter on the Deflagrator Avhich I 

 sent you last spring. I fear you have done me more than 

 justice.* 



* See No I. vol. IV. of this Journal, for October last. 



