364 Dr. Hare's Calorimotor and Dejiagrator. 



Dr. Hare's Calorimotor. 



Since the publication of our last number, we have through 

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

 constructed under the direction of the inventor, on a large 

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

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

 ments fully confirmed. 



The facilities which this instrument affords for exhibit- 

 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^ot. 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 FroL 3 onf^ Griscom, dated August 

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

 ner, the F-Tbtement made in the last number of the Am. Jour- 

 nalVekfive to the power and operation of Dr. Hare's Gal- 

 vanic Instruments The rapidity with which the Calorim- 

 otor causes she ignition and even fusion of an iron wire 

 some inches in length, and as thiik as a goose quill, 

 and the beautifully variegated coruscations of the burnmg 

 hydrogen k'ndled 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 of 

 the finest exhibitions that can be made to a class. It »s siir- 

 passed by nothing but the overpowering brilliancy of the 

 Deflagrator. The effect of this instrument upon two piece? 



* Sec the anuexetl paper. 



