MAGNETO-ELECTRIC INSTRUMENTS. 01 



to place the foot on, or to apply to any part under the 

 clothes. It may be used agreeably, and with much effect, 

 by the patient holding one of the handles, and another per- 

 son the other handle, and with the other hand making 

 passes over or around the diseased part. This is particu- 

 larly useful about the head, and where the pain is under the 

 hair it should be thoroughly wet, to have the effect pass 

 through it. The best effects have followed from regular 

 applications of a mild power, from five to fifteen minutes, 

 twice or more a day ; a great power in many cases of ner- 

 vous disease failing to secure the best effects, by the reac- 

 tion produced in the system. The machine may be used 

 with confidence, no injury being known to result from its 

 use. Five sizes in polished mahogany cases, with a pair of 

 conductors and foot plate. 



Price, extra large size contained in a case, 



13 in. long, 8 in. wide, 6 in. deep, $15.00. 



" 1st size, 11 " " 6 " " 41 " " $12.00. 



" 2d " 9 " " 5 " " 4 " " $10.00. 



(i ),] h tt 4 K <( o \ 



.* 1 $10.00. 



very portable, j 



" 2d " with battery packed below the 



machine, 7 in. long, 3 in. wide, 6 in. deep, $ 8.00 



Improved Graduated Magnetic Machine, for Medical pur- 

 poses (Fig. 472, next page), being the most perfect, conve- 

 nient, and portable instrument in use, with all the improve- 

 ments to 1848. 



Description. The machine consists of a double coil or 

 helix of coarse copper wire, insulated, over which is wound 

 about a thousand feet of fine insulated copper wire, in the 

 interior of which is placed a rod formed of soft iron wires, 

 and which, when the machine is in operation, becomes a 

 powerful magnet, and regulates the strength of the power 

 according to the extent the rod is placed in. At one side 

 of the machine is an electro-magnet, formed of soft iron, and 

 bent in the form of a U, and wound with two coils of covered 

 copper wire, one end of which is soldered in the magnet, and 

 the other communicated with the coarse helix. To one end 

 or pole of the electro-magnet is fastened a spring, with a 

 small hammer at one end, and just over the pole of the elec- 

 tro-magnet ; and through which spring the power of the 

 battery flows, from the point of a screw supported on two 



