364 Dr. Hare-s Calorimoior and Dejlagrator 



Dr. Harems Calorimotor* 



Since the publication of our last number, we have through 

 the kindness of Dr. Hare, obtained this fine instrument, 

 constructed under the direction of the inventor, on a large 

 scale, and in the most perfect manner. We cannot now do 

 any thing more than to say that we find all Dr. Hare's state- 

 ments fully confirmed. 



The facilities which this instrument affords for exhibjt- 

 ing the new and interesting phenomena of magnetism, as 

 produced by Galvanic Instruments, are, we believe, une- 

 qualled, particularly in imparting a very powerful magnetic 

 virtue to needles and in causing Iron filings to be taken up 

 readily by wires and strips of all sorts of metals — whether 

 Iron* form a part of the connection or not. We have also 

 been much struck by the permanency of the action of the 

 Calorimotor. The same diluted acid continues to ignite 

 large wires for many weeks in succession, and with slight 

 additions of fresh acid to the fluid, the full effects are at any 

 time easily renewed. 



Extract of a letter from Fwf. 3 ohjh Griscom, dated Angxisi 



26, 1821, to the Editor. 



It gives me pleasure to acknowledge that the experi- 

 ments which, in company with Bishop Brownell, I had the 

 pleasure of witnessing in the laboratory of your college on 

 the 9th inst. went to confirm in the most satisfactory man- 

 ner, the statement made in the last number of the Am. ^^^'^ 

 nal relative to the power and operation of Dr, Hare's Gal- 

 vanic Instruments. The rapidity with which the Calorim- 

 otor causes the ignition and even fusion of an iron wire 

 some inches in length, and as thick as a goose q«"h 

 and the beautifully variegated coruscations of the burning 

 hydrogen kindled by the ignited wire, and the play of the 

 flame on the surface of the liquid after the plates are raised 

 out of the trough, rendered this experiment at once, one o 

 the finest exhibhions that can be made to a class* It *s^^J^' 



pa 



Deflagrator. The effect of this instrument upon two piece 



s 



* See the anuexetl paper- 



