314 Mr. R. H. M. Bosanquet on 



H = *181, horizontal component. 

 / = 26 centim., distance of poles of bar. 

 Length of bar = 28*50 centim. 

 Separate piece = 1*58. 



2R' = 1-97 steel. 



2R = 1-90 soft iron. 



Fundamental Equations. 



Moment == . . T f tan 6. 

 4/iH 



Moment _ . 

 -, = Pole. 



4tt Pole = ttR 2 ^ or 4 Pole = R 2 23; 



4 moment m ...,/. 



•'• jYrz — —-o, magnetic induction. 



M.M.F. = AirCn, magnetomotive force. 

 x= ™ total stance. 



«4= — - — ? resistance of bar (/ul found from 53 in 

 ^ Rowland's table). 



x a =x— oo bj air resistance. 



2a = YT, air resistance for unit radius. 



Jtv 



2aR', air resistance for radius R'. 



Soft iron bar. 



A = 37 inches. 



I. IT. 



Current 1*283 *83 ampere. 



Deflection 21°'8 14°-0 



Moment 5405 3369 



53 921 574 



x -31495 -32685 



fi 1100 842 



2a -30426 -30855 



Mean value of 2« = '30640, 

 w hence 



2«R' = -30181. 



