I. ELECTRICAL MACHINES, ETC. 271 



This model of a magneto-electric machine is one that has been constructed 

 for the purpose of showing the great increase of the electric current by the 

 use of an electro-magnet in place of the permanent magnet, when such magnet 

 is excited or charged by a galvanic cell ; and this principle is applicable to all 

 magneto-electric machines using soft iron magnets. 



1332a. Portable Magneto-Electric Machine, with double 

 coiled magnet. Harvey, Reynolds, and Co. 



1336. Electro-Dynamic Light-producing Machines. 



Siemens and Halske, Berlin. 



For setting these dynamo-electric machines in action a force of 6 horse- 

 power is required for the larger and one of 3 for the smaller. 



1336a. Various examples of Magneto-Electric Appa- 

 ratus. 



Electro-magnet, by Repmann. 



Electro-magnet, by Jablokoff. 



Electro-magnetic machine by Gramme, with a Jamin magnet of 

 0-08m. 



Two secondary elements, by Plante. 



Battery of 20 secondary elements, by Plante. 



Battery of 20 secondary elements, by Plante". 



Regulator of electric light, by Serrin, with glass globe. 



Magneto-electric machine, by Gramme, for electric light of 150 

 burners. 



Magneto-electric machine, by Gramme, with electro-magnet for 

 laboratory. 



Magneto-electric machine, by Gramme, with a Jamin magnet 

 (small model). 



Magneto-electric machine, by Gramme, with a Jamin magnet 

 (large model with flier and pedal). 



Exploder, with Jamin magnet (large model) with bobbin, cable, 

 and key. 



Exploder, with Jamin magnet (medium model). 



Magnet, Jamin's, with plates 0'05m. in width. 



M. Breguet, Paris. 



f. OTHER MODES OF PRODUCING ELECTRICITY OR ELECTRIC 

 CURRENTS. 



1337. Apparatus, designed to obtain electric currents by 

 means of the combined action of gravity and motion. Preliminary 

 experiments only have yet been made with it. 



George Gore, F.R.S. 



1336. Apparatus for investigating electric currents produced 

 by the friction of different metals. (Not yet completed.) 



George Gore, F.R.S. 



