234 Mr. G. Owen on the Discharge of 
electric force for this temperature (1066°C.) was found to 
be 10280 microvolts. The current through the wire was then 
increased until the thick platinum wire just melted. The. 
Fig. 2. 
LARTH 
70 PUMP 
[ 
latter will melt before the wires of the couple, as the tem- 
perature of the couple, owing to conduction along the wires, 
must be somewhat lower than the actual temperature of the: 
melting platinum. The thermoelectric force at the melting- 
point of the platinum was found to be 18290 microvolts. 
The values of the thermoelectric force for the same couple at 
the same temperatures (taking the melting-point of platinum 
as 1780° C.) found by Le Chatelier are 10560 and 18200 
respectively. 
The Nernst filament passed between the wires of the couple 
which were drawn as tightly as they would bear, the junction 
being symmetrically placed on the upper side of the fila-. 
ment. The galvanometer used to measure the thermoelectric 
current gave 1 division for 4° x 10-8 amperes. This method 
of measuring the temperature of the filament can hardly 
claim for itself great accuracy in regard to giving the actual 
temperature of the filament, as the temperature indicated by 
the couple will depend largely upon the way the junction lies 
on the filament. It is, however, a very convenient way of 
keeping the temperature of the filament constant, and of 
