288 Dr. Harems Description of Voltaic Series, &fc. 



printed pages, abstracted from the Transactions of our American 

 Philosophical Society, Vol. V, Part 3, lately published. 



Galvanic Dejiagrator of one hundred pairs, of fourteen inches 



by eight. 

 Fi°r. 1. 



Fig. 1 represents a voltaic series, upon the plan of the trough of 

 Cruickshank, associated with another trough destitute of plates, and 

 of a capacity sufficient to hold all the acid necessary for an ample 

 charge. The trough containing the series is joined to the other 

 lengthwise, edge to edge, so that when the sides of the one are ver- 

 tical, those of the other must be horizontal. The advantage of this 

 arrangement is, that by a partial revolution of the two troughs, thus 

 united, upon pivots which support them at the ends, any fluid which 

 may be in one trough must flow into the other; and, reversing the 

 movement, must flow back again. The galvanic series being placed- 

 in one of the troughs, the acid in the other, by a movement such as 

 above described, the plates may all be instantaneously subjected to 

 the acid, or relieved from it. The pivots are made of iron, coated 

 with brass or copper, as less liable to oxidizeraent. A metallic com- 

 munication is made between the coating of the pivots, and the gal- 

 vanic series within. In order to produce a connexion between one 

 recipient of this description and another, it is only necessary to allow 

 a pivot of each trough to revolve on one of the two ends of a strap 

 of sheet copper. To connect with the termination of the series, the 

 leaden rods, to which are soldered the vices, or spring forceps, for 

 holding the substances to be exposed to the deflagrating power, one 



