used in Electrical Measuring-Instruments. 



439 



Shape of Section. 



H 1, 



U- 



... 



Deflecting moment 



iMoment of inertia 



2b 



t 



zoo 



.6- 



«-& 



«- ->l 



4 sin 9 



3tt6 



30 V"*-/ 



3i 



2(6 2 +« 2 ) 



3 



46* 



3b 



p+a*+W 



* 2 +£ 



36 



* 2 4-a 2 4-36 2 



Proportions in 

 particular cases. 



0=30°. 

 0=45°. 



19°A=§, 



2ft = 6. 

 4a =6. 



o 15 



"4-8 



c=i L, 





Deflecting 

 moment 

 per unit 

 Moment 



of inertia. 



102 



0-91 

 095 



0-80 



0-44 [ 



0-97 

 091 



0-79 



0-47 

 0-38 



0-40 

 0-53 

 0-49 



Instrument. 



Low-resistance 

 d'Arsonval. 



Jolin's 

 High-resistance 



d'Arsonval. 

 Wattmeter (Ganz 



and Co.), 60 



amperes. 



Dynamometer 



(Siemens), 60 



amperes. 

 Dynamometer 



(Siemens), 500 



amperes. 

 Wattmeter 



(Siemens), 500 

 amperes. 



