338 Dr. Harems Dejlagrator and Calorimoior. 



1. I connected the zinc pole of the Calorimotor, with the 

 copper pole of the troughs, and vice versa, and then dividing 

 the troughs (containing three hundred pairs of four inch 

 plates,*) at another place, connected them at these new poles 

 by points of well prepared charcoal ; the sparks passed free- 

 ly and vividly, nor did it, apparently make any difference, 

 whether the plates of the Calorimotor, were immersed in 

 the fluid, or not. I then disconnected the troughs from 

 the Calorimotor, and connecting them together, received the 

 spark, which was quite as vivid, as when the Calorimotor 

 formed a part of the series. I now immersed the Calori- 

 motor, and found that it acted by itself, with its appropriate 

 energy, readily igniting iron, and displaying its usual mag- 

 netic activity, 



2. The Calorimotor and Deflagrator were connected in~ 

 such a manner, that the former was interposed between the 

 two equal divisions of forty coils each, contained in the two 

 troughs of the Deflagrator; in different trials, the connexion 

 was varied, sometimes the zinc poles, and sometimes the 

 copper poles of the two instruments, being connected, and 

 at other times, the zinc of the one being joined to the cop- 

 per of the other, and vice vei'sa. 



When the metals of both instruments were in the air, only 

 a very feeble spark passed through the charcoal points con- 

 necting the proper poles of the Deflagrator. When the 

 plates of the Calorimotor were immersed, those of the De- 

 flagrator being in the air, the spark was not increased, but 

 remained feeble as before. The coils of the Deflagrator 

 being then immersed, the usual splendor of light, instantly 

 burst from the charcoal points, and all the dazzling bright- 

 ness and intense heat of the instrument were displayed, hut 

 ivithout any increase of power derived from the Calorimotor. 

 The plates of the Calorimotor were now raised from the 

 fluid, those of the Deflagrator remaining immersed, but the 

 light and heat were equally brilliant as before. The De- 

 flagrator and Calorimotor were now separated, and each 

 produced its appropriate effects, in full energy. 



3. The Calorimotor — the Deflagrator and the troughs, 

 containing the three hundred pairs of four inch plates, were now 

 connected into one series, in such a manner, that the Calor- 



* Cemented in the usual manner, into mahogany boxe?. 



