W. A, Anthony—Electro-magnetic Machine. 253 
University in the department of Chemistry and Physics. More 
extended tests will be made after the machine returns from the 
exhibition, when a dynamometer will be procured to measure 
the power consumed. 
TABLE I. 
Armatures joined in series; resistance + ohm. 
Magnetic coils joined in series; resistance 1 ohm (nearly). 
No. of ‘ ; 
vk revolutions E. M. F. Volts. tees oe Current. Webers. 
ms. 
54 68° 6°74 10°22 
572 54°05 11°06 4°91 
560 51 141°5 0364 
419 36°85 11°06 3°35 
TABLE I. 
One armature supplying the useful current, the other in circuit with magnet 
coils which were joined in series. 
No of revolutions Total resistance Useful currert. 
per minute E. M. F. Volts. | of bee — Webers. 
323 241 4:39 5°49 
319 8 3°67 6°50 
313 23°34 2°82 8°27 
309 23°28 2°65 8°78 
309 23°17 “81 2°36 
309 25°1 19°19 131 
309 25°8 62°95 40 
279 18°7 62°95 30 
279 16°6 2°82 5°88" 
I ae gi cies 
minu pe 
the range of adaptability of the machine 
ser 
of the ]i 
eral resu 
te. I speak of the experiment only to show 
riments was made to determine the character 
€s Of ex 
ght produced by the machine, with the following gen- 
Number of revolutions per minute, 487 to 525. 
10 
Resistance of light, about 
Entire 
+5 to 11°5 Webers. 
4 ohms. 
5°6 
I Tesistance, 5 ohms. 
htensity of light (average), 1600 candles. 
