NO. 2 



HISTORY OF ELECTRIC LIGHT SCHROEDER 



55 



core. AH the primary coils were connected in series, which, when 

 current went through them, induced a current in the secondary coils. 

 Lamps were connected in multiple on each of the secondary coils. 

 An American patent was applied for on the transformer, but was 

 refused on the basis that " more current cannot be.taken from it than 

 is put in." While this is true if the word energy were used, the 

 transformer can supply a greater current at a lower voltage (or vice 

 versa) than is put in, the ratio being in proportion to the relative 

 number of turns in the primary and secondary coils. The transformer 

 was' treated with ridicule and Gaulard died under distressing cir- 

 cumstances. 



Gsns+ant 

 Voltage 

 Alternating ( 

 Current / 

 Dijnamo 



7^ 



High Voltage Circuit 



VmA 



o 



o 

 o 



pn 



'110 Volt Circuits^ 



O 

 O 



o 

 ■o 



DiAGRAM OF Stanley's Alternating Currknt Multiple 

 System, 1885. 



This sA'Stem is now uniYersally used for distributing electric current 

 long distances. 



Information regarding the transformer came to the attention of 

 William Stanley, an American, in the latter part of 1885. He made 

 an intensive study of the scheme, and developed a transformer in which 

 the primary coil was connected in multiple on a constant potential 

 alternating-current high-voltage system. From the secondary coil a 

 lower constant voltage was obtained. An experimental installation 

 was made at Great liarrington, Mass., in the early part of 1886, the 

 first commercial installation being made in Buffalo, New York, in 

 the latter part of the year. This scheme enabled current to be eco- 

 nomically distributed to much greater distances. The voltage of the 

 high-tension circuit has been gradually increased as the art has pro- 

 gressed from about a thousand volts to over two hundred thousand 

 volts pressure in a recent installation in California, where electric 

 power is transmitted over two hundred miles. 



