486 



Prof. J. A. Fleming. Conversion of Electric [Jan. 24, 



Table II. Ratio of Electrodynamometer (D) to Galvanometer (G) 



Readings in Milliamperes. Form Factor of E.M.F. Curve = 

 1-115 =/. 



Carbon filament at 11 volts, 3 '77 amps., 41 -7 watts. 



D. 



0-85 

 33 

 87 

 30 

 20 



3-52 

 4-54 



a. 



0-57 

 0-85 

 1-16 

 1-40 

 1-88 

 2-10 

 2-81 



1-49 

 1-56 

 1-61 

 1-64 

 1-73 

 1-68 

 1-62 



2//a+/=/S. 



0-86 

 0-83 

 0-82 

 0-81 

 0-78 

 0-80 

 0-82 



Mean 



f = 0-82. 



Carbon filament at 10 volts, 3 '44 amps., 34 -43 watts. 



0-50 

 1-34 



2-28 



72 

 '78 

 02 



0-34 

 0-86 

 1-48 

 1-68 



71 



'87 



3-53 



2-17 



30 

 25 



92 



88 



1-47 

 1-56 

 1-54 

 1-62 

 1-63 

 1-62 

 1-63 

 1-47 

 1-48 



Carbon filament at 9 volts, 3' 112 amps., 28 '0 watts. 



0-40 

 0-73 

 1-28 



0-31 

 0-50 

 0-83 



29 

 46 



1-65 

 1-82 

 1-78 

 1-93 

 1-94 

 1-87 

 1-83 

 1-73 



15 

 26 

 26 

 35 



1-41 



41 

 39 



1-54 

 1-43 

 1-44 

 1-41 

 1-43 

 1-38 

 1-38 

 1-32 



1-37 



1-26 



0-93 

 0-87 

 0-84 

 0-88 

 0-87 

 0-88 

 0-88 

 0-89 

 0-91 

 0-92 

 0-94 



Mean 



= 0-89. 



formed between carbon rods, and an iron rod was placed so that its 

 end dipped into the arc. An ammeter was connected in between 

 either carbon and the iron rod, and indicated a continuous current of 

 negative electricity flowing through the ammeter from the iron rod to 

 the carbon pole. This current was, however, greatly increased by 

 making the iron rod of a piece of iron pipe closed at the end and 



