SOME WAYS OF PRODUCING ELECTRICITY 185 



coil into the electric circuit. Hold one end of the coil near the north 

 pole of the compass needle. Press the button to pass an electric cur- 

 rent. Result ? Hold the other end of the coil near the north end of 

 the compass. Result? Make a similar test with the iron core inside 

 the coil. Compare strength of magnetism. Complete diagram C. 

 Label poles of the electromagnet correctly. 



REFERENCE READING 



Lunt, J. R., Everyday Electricity. Macmillan, 1927. 

 Meister, M., Magnetism and Electricity. Scribner's, 1929. 

 Parker, B. M., The Book of Electricity. Houghton, Mifflin, 1928. 

 Wade, H. T., Everyday Electricity. Little, Brown & Co., 1924. 



