106 



TRANSACTIONS OF THE 



[dec; 21, 



Let us hastily review the public experimeuts, which epitomize 

 the results of his labors. 



In 1881, at the Paris Electrical Exhibition, he exhibited in the 

 Palace of Industry, one dynamo furnishing i)ower to 27 different 

 pieces of apparatus. No measurements of efficiency were made, 

 as the question of distribution was the only one then to be solved. 

 He, however, then stated that it was possible to transport a use- 

 ful work of 10 liorse-power 31 miles by means of an ordinary 

 telegraph wire, with the expenditure of only IG liorse-powcr on 

 tlie generating dynamo, realizing C2^ per cent mechanical ef- 

 ficiency. 



At the Munich Electrical Exliibition of 1882 over a line of 

 telegraph wire 3G miles he obtained an electrical efficiency of 39 

 per cent, and an actual meclianical efficiency of 30 per cent. In 

 his experiments on the lines of the Chcmin do fer du Nord, 

 March 4, 1883, he transported 5.G horse-power 8^ miles over 

 ordinary telegraph wires, with 9.7 horse-power at the generat- 

 ing dynamo realizing an electrical efficiency of G9^ per cent, and 

 a niechanical efficiency of 58jV pei" cent. 



In his experiments, announced October 16, 1885, he obtained 

 from his first, 77 percent electrical, andlTj^o pei" cent mechanical 

 efficiency. In the second experiment he obtained 78 per cent 

 electrical and 53yL mechanical efficiency by means of dynamo- 

 metric measurements. The distance between these two points is 

 5G kilometers, about 35 miles. The speed of tlie generator 

 varied from 170 to 190 times a minute, and there was no appre- 

 ciable heating. 



Tabulated results of experiments of Marcel Deprez — Convec- 

 tion of work between Creil and Paris: 



Turns per Minute 



Diflf. of Potential 



Current 



Work in Field 



AVork in Armature.. . 

 Measured Mech. Work 



Electrical Efif 



Mechanical Eff 



First Experiment. 

 Generator. Motor. 



190 



5469 Volts. 



7.21 Amperes. 



9.20 H.P. 

 53.59 " 

 63.10 " 



n% 



248 

 4242 

 7.21 

 3.75 

 41.44 

 35.80 



Second Experiment. 

 Generator. Motor. 



170 277 



5717 Volts. 4441 



7.20 Amperes. 7.20 



10.30 3.80 



55.90 43.40 



Gl. 40. 



78 r^ 



53A;g 



Kesistance of line, 100 ohms. 

 " " generator, 33 ohms. 



'< " motor, 36 ohms. 



