Currents arising from two' fine heated Platinum Wires. 955 



the central wire, while in the latter case, the movable wire 

 was below the central wire. The heating current employed 

 was 1200 amp. It is clearly seen that, corresponding to a 



3=525 



3 



i 



•i Em 





plane of wires fOOTTRALwiir A 

 HORIZONTAL. j+ moveable wire. B. 



PLAfcF OF WIRES X CENTRAL WIRE . C . 

 VERTICAL . 1_,.,,_.- r „- rv 



CEWTIWi.VMEtBW'.iaMffl'WB^ '*st. 



?A\£ VviiSS .^nCAL'A CENTRAL AIRE. E 



D!5VA>"-- PTTV/ET. 





distance apart o£ the wires equal to 2'5 cm., with the 

 movable wire disposed vertically below the central wire, the 

 latter experiences a considerably greater cooling effect than 

 the movable wire experiences when the central wire is 

 disposed below it. Furthermore, the difference of ordinates 

 of the curve E and F corresponding to this distance is very 

 considerably greater than that for the curve C and D, so 

 that on using the wires disposed at this distance as an 

 inclinometer, the deflexion obtained on rotating through 

 270° from the initial horizontal position would be consi- 

 derably greater than that corresponding to a rotation of 90°. 

 The author desires to express to Dr. Charles Carpenter j 

 C.B. B., his thanks for the provision of the facilities necessary 

 for carrying out the work detailed in this paper. 



28 April, 1921. 



3R2 



