270 SEC. 10. ELECTRICITY. 



1321. Magneto-Electric Machine (Clark's form). An early 

 machine by Logemann, of Haarlem. . James How $ Co. 



1322. Electro-Magnetic Coil Machine, for medical im- 

 plication. Primary and secondary currents. James How fy Co. 



1323. Magneto-Electric Machine, with alternate current 

 for production of light. La Societe V Alliance. 



An electro-magnetic machine, with four discs or 64 bobbins with alternate 

 current for the production of light. This machine, which requires a three 

 horsepower, revolves from 400-450 lines per minute and produces 200. 



1324. Magneto-Electric Machine, workable by hand or 

 steam. La Societe V Alliance. 



An electro-magnetic machine for the purpose of demonstration with eight 

 bobbins with direct and alternate current, workable by hand or steam. 



1325. Experimental Magneto-Electric Machine, the 



first constructed in which electricity and magnetism, rendered 

 active by the expenditure of mechanical force, were made to act 

 and re-act on one another in such a way as to greatly increase the 

 development of their force. 8. Alfred Varlcy. 



This machine was the first of its class, and acted on what was a new princi- 

 ple at the date of its construction. The new principle consisted in making 

 electricity and magnetism, rendered active by the expenditure of mechanical 

 force, act and re-act on one another in such a way as to greatly increase the 

 development of their forces. In this machine iron bobbins wrapped with 

 insulated wire are revolved between the holes of very feeble magnets made of 

 soft iron. The electricity (small in amount when the machine is first put in 

 motion) which is developed in the insulated wire of the bobbins passes, by 

 means of a commutator, through convolutions of insulated wire surrounding the 

 soft iron magnets, and renders them more highly magnetic. 



The magnetism of the soft iron magnets being thus increased, developes a 

 corresponding increased quantity of electricity in the revolving bobbins, which 

 re-acts on the soft iron magnets, rendering them still niore highly magnetic. 



The expenditure of mechanical force giving motion to the machine is 

 greater as the magnetism and electricity developed increases the consumption 

 of mechanical force having relation to the quantity of electricity rendered 

 active. 



1326. Gramme's Magneto-Electric Machine, for electro- 

 typing. //. Fontaine. 



1327. Gramme's Magneto-Electric Machine, for electric 

 light. H. Fontaine. 



1328. Gramme's Magneto-Electric Machine, for electric 

 light of great power. H. Fontaine. 



1329. Gramme's Magneto-Electric Machine, for demon- 

 strating. H, Fontaine. 



1330. M. lie Roux's Electro-Magnetic Apparatus, for 



showing the effect of magnetism on copper discs. M. Ruhmkorff. 



1331. Model of a Magneto-Electric Machine, designed to 

 illustrate the advantage gained by the use of an electro-magnet in 

 place of the usual permanent magnet. William Raynor. 



