ELECTRICITY AND ELECTRO-MAGNETISM. Plan I. 



TrM-fet Glaaa PUte Klectiical Machine. (See |U(n 171 lad 941). 



An extended dncriptiol of tht 

 Rhumkorf coil has been givrn at 

 pageaUd 257 ; butailUarrangf- 

 mm and management require, 

 great care, we hare added, In the 

 annexed cuu, an Uluitration of 

 various mmutiir of detail, whkh 

 will require the attrntio* of the 

 experimenter. It will be tern, 

 that In fig. I. an ordinary ex- 

 hautted receiver, inch a* it em- 

 ployed in Friction*! Electricity. U 

 represented at attached to the 

 econdary wire of the coil; and 

 the phenomena thun obtained, are 

 extremely beautiful, if a (jod 

 vacuum be produced by mraot f 

 the air-pump. 



Fig. 1. RhuraVorf. eoil K, ex- 

 haunted receiver. (Set Experi- 

 ment 16, page 250). 



I'ig. 1. B, B. the polei of the 

 flue coil ; P, P. the glu* piUan 

 upponinn them ; A, A, wire* from 

 the battery, connecting it, by I.X, 

 with the primary (oil. (se al 

 Fif. S). 



Fig. 9. A, the conuct-brtaker ; 

 B, lu handle. 



Fig. 4. The termina. wirM of 

 Iht aecondary coil, arranged for 

 the ipark. (See Experiment. II 



U. pageJJi). 



Fig. i. Outline view of Fig. 1. 



Fig. 6. Book arranged for pierc- 

 ing the leave*, by ipark from the 

 tecondary eoil (See ExprrUneut 

 17. page U6). 



Toe lUiuiukor(-coU Apparalui. (.-we page* t>4 aji . 



