International Library of Technology · Scranton, International Textbook Co. · leaf 86
cuit by itself. The direction of the lines of force in any magnetic fieldcan be traced by a small freely suspended magnetic needle,or a small compass such as is shown by in in Fig. 922. Thenorth pole of the needle will always point in the direction ofthe lines of force, the length of the needle… … Fig. 921. ELECTRICITY AND MAGNETISM. 1521 with the direction of the lines of force along that part of themagnetic field. In Fig. 922 the arrow-heads indicate thedirection of the lines of force. It will be noted that inFigs. 930, 921, and 923, the magnetic lines are shown in
Electrical engineering
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