ELECTRICITY AND MAGNETISM. 



(73) THE MOUSE ALPHABET. 



T 



U 



ti 



v 



w 



X 



Y = - 



Z 



Understood 



A 



A ,- . 



C 



Ch > 



D 



E - 



F 



G 



H 



I 



J 



L 



N 







Full stop ^. - 

 Semicolon * *-** 



Comma 



Repeat (?) 



Hyphen 



Apostrophe 



(74) INTENSITY OF MAGNETISATION. 



C.G.S. units. 



Maximum for iron and steel at 12 C. (Rowland) ...1390 

 nickel ,, ... 494 



cobalt ,, ,, ... 800? 



Magnetic moment of earth (Gauss) ...8'55 X 10 25 



Hence if the earth were uniformly magnetised it would be 

 equivalent to about ^Vu of its volume of strongly magnetised 

 steel. 



