ELECTRO-MAGNETIC INSTRUMENTS. 



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Electro- Magnet. (Fig. 424.) This 

 consists of a piece of soft iron bent in a 

 U form, and surmounted with a coil, or 

 succession of coils of insulated copper 

 wire, the ends of which are connected 

 with a voltaic scries. Attached to the 

 faces of the magnet is a piece of iron 

 cailed the lifter, having a hook or ring 

 for suspending any weight. 



Price, three sizes, $1.00, $1.50, 

 and $2.50. 



Large Electro- Magnet. (Fig. 425.) 

 This cut represents one of the most ele- 

 gant modes of mounting large electro- 

 magnets. The magnet is mounted, poles 

 upward, on a firm and substantial base, 

 having a pillar with an arm, or lever, 

 passing through a mortice on the top of 

 it ; the lever being attached to the lifter 



Fig. 425. 



Fig 424. 



over the poles of the magnet, the coils on the electro-mag- 

 net are attached by their ends to the screw cups on the 

 base, or conveniently connecting with the battery. 



Price, $20.00 to $40.00. 



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