I.C.S. reference library : a series of textbooks prepared for the students of the International Correspondence Schools and containing in permanent form the instruction papers examination questions, and keys used in their various courses (1904)
International Correspondence Schools · Scranton : International Textbook Co. · leaf 396
Fig, li. §8 ELECTRICITY AND MAGNETISM. 17 through the magnet to the north pole again, as shown inFig. 13. This is called the direction of the lines of force, andthe path which they take is called the magnetic circuit. … Fig. 13. 23. The direction of the lines of force in any magneticfield can be traced by a small, freely suspended magneticneedle, or a small compass such as indicated by ;;/ in Fig. 13.The north pole of the needle will always point in the direc-tion of the lines of force, the length of the needle…
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