



Figure 73. — Marcel Deprez repeats Fontaine's demonstration showing that electric power 

 could be transmitted at a distance. Deprez transmitted his power 57 kilometers to drive 

 a Gramme motor belted to a centrifugal pump at the Munich Exposition of 1882. From 

 La Lumiere electrique, 1883,. vol. 8, p. 131. 



was made the following year at the school of military 

 engineering in Chatham, England.'"" See table 5. 



107 "Bericht iiber Versuche mit elektrischen Lichtapparaten 

 seitens der Militair-Ingenieurschule in Chatham in den 

 Jahren 1879-1880," Elektrotechnische Zeitschrijt, 1881, vol. 2, 

 pp. 67-71, 105-110. 



The two Siemens model B machines were connected 

 in parallel, as were the two Gramme model A gener- 

 ators. While the results are not directly comparable 

 with those of Shoolbred, nevertheless they again 

 suggest the electrical superiority of the Gramme 

 dynamo. On the other hand, the reported efficiency 



T.^BLE 3. — Data on three models of an English Siemens dynamo produced by Higgs 



and Brittle. 



Length-width-height Weight Light 



Model {inches) {lbs.) R.p.m. {candles) 



A 25 X 21 X 8.8 298 1100 1000 



B 29 X 26 X 9.5 419 850 4000 



C 44x28.3x12.6 1279 480 14800 



Hp. CPIHP 



1. 5-2. 500-670 



3.0-3.5 1150-1330 



9-10 1480-1650 



390 



BULLETIN 228 : CONTRIBUTIONS FROM THE MUSEUM OF HISTORY AND TECHNOLOGY 



