ASTROXOM I C A L I XSTR UM ENTS. 



383 



battery-current. The power of a moderate sized pot- 

 battery, fig. 391, is sufficient for working this engine, the 

 current of which circulating in these helices, induces mag- 

 netism in the bent bars, and powerfully attracting them 

 within the helices ; when, by the revolution of the axle, 

 the spring is separated from the break-piece, and the cur- 

 rent stopped, the momentum of the fly-wheel bringing up 

 the crank, and bent iron rod, again to be attracted and 

 brought up thus producing a rapid and uniform motion. 



Price $10.00. 



Fig. 799*. 



J^&* 



Improved Magnetic Electric Machine for Medical Application. (Fig. 

 799|.) A, horse-shoe magnet; B, wire coil; C, armature; D, dri- 

 ving-wheel ; E, pulley-wheel ; G, handle ; H, regulator ; I, conduct- 

 ors. The electrical current is obtained by turning the handle, which 

 by means of cog-wheels and a pulley, revolves an armature with a 

 coil of insulated copper wire on each pole, against a permanent mag- 

 net. No liquids or acids are required. Whatever part of the body is 

 affected, to which electricity is to be applied, the conductors may be 

 moved about each side of the part affected, to distribute the electricity ; 

 and if covered with a sponge or flannel, and wet, the effect is more 

 agreeable, and the power increased. They are used in the treatment 

 of paralysis, rheumatism, nervous, and many other diseases, with 

 great success. Price $10 00. 



