94 Dr. Hattys Dejlagrator and Calonmot^, 



PHYSICS AND CHEMISTRY, MECHANICS AND THE 



ARTS. \ 



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



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

 the University of Pennsyhania^ and the Editor^ on the sub^ 

 ject o/'Dk. Hare's Calorimotor and Dejlagrator^ and the 

 phenomena produced by thenu , 



INTRODtJCTORY REMARKS. 



It may be remembered, by tbe readers of this Joarnal^ that 

 JQ the letter alluded to below by Dr- Hare, (see p. 201, vol. 

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

 performed with the Deflagrator, states that he had discov- 

 ered a very unexpected and surprising incompatibihty be- 

 tween the Deflagrator 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, cachinstrument instant- 

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

 to this subject. 



t' 



Letter !•— From Dr. Hare, on the incompatibility of 

 the above instniments, and the common galvanic Batteries 



when used in connexion. 



Philadelphia^ JS'ovember 5, 1821 



My Dear Sir, 



I HAVE received your letter on the Deflagrator which I 



sent you last spring. I fear you have done me more tf^an 

 justice.* 



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



