190 



Mr. H. Pender on the Magnetic 

 Fiar. 1. 



The Coil. — The constants of the coil, the induced current 

 in which was to be measured, are as follows : — 



Menn diameter .... 30 cm. 



Width 38 „ 



Thickness ...... 1'27 ,, 



Number of turns .... 1295 



Resistance 140 obms 



Size of wire #21 B. & S. 



This coil (I, fig. 1) was suspended between the two inside 



