50 BENJ. PIKE'S, JR., DESCRIPTIVE CATALOGUE. 



The galvanic battery consists of an oblong square vessel, 

 or box of copper, having a space all around, of about an 

 inch, inclosed with copper, for the liquid ; and within which 

 is suspended a square frame of zinc, so arranged as not to 

 be in contact with the copper, it being supported by cross 

 bars of metal under which wood is fastened, to insulate it 

 from the copper. There is a small tube in one of the cor- 

 ners of the zinc, and also of the copper vessel, to insert the 

 connecting wires from the machine. There is a projecting 

 piece within each end of the inner apartment of the battery 

 to set the zinc on when not in use. The space in the middle 

 contains the machine when transported, also the conductors, 

 wires, &c. The liquid employed is blue vitriol (sulphate of 

 copper), dissolved in hot water, about two ounces to a quart 

 of water, left to cool before using. The liquid requires to be 

 renewed Avhen the acid is entirely taken up by the zinc, 

 which will be known by there being no deposit on the zinc, 

 after being immersed for a few minutes ; in which case the 

 liquid is poured out, and a new solution made, also any sedi- 

 ment cleaned out. The zinc frame should be left in the 

 solution only while the application is made, as it soon be- 

 comes coated with a deposit which should be cleaned off 

 after using, or if left to dry on may be scraped off with an 

 old knife, a clean surface of zinc being necessary to the 

 perfect operation of the machine. The solution may remain 

 in the copper any length of time, as it does not act on it. 



Directions. Fill the exterior apartment of the copper box 

 about half or two-thirds full of water, in which is dissolved 

 an ounce and a half of blue vitriol. Place the zinc frame 

 within it, care being taken to keep the zinc free from contact 

 with the copper, in all directions. Fasten one end of one 

 of the connecting wires securely in the hole in the corner 

 of the zinc, the other wire in the copper, and the other ends 

 in the cups with binding screws at the side of the instrument. 

 Touch the spring with the finger, and the vibrations will 

 continue by the power of the battery. The effect is received 

 from handles, or conductors, attached to wires secured in 

 the cups with screws at the end of the instrument. The 

 flat conductors, with cork handles, are to apply to or around 

 any diseased part ; or one handle may be held in the hand, 

 and one of the conductors applied around the part affected. 

 These are pleasantly used with a sponge tied over one of 

 them, and wet with water. Metallic plates are also used 



