Andrews, Ernest John, 1863-, Howland, Howard Newell, 1865- joint author · New York, London, The Macmillan company · leaf 197
ne ironfilings evenly overthe cardboard,and jar the tableslightly to assist in getting the filings into the positionwhich they seem naturally to take. An arrangement likeFig. 83 will be obtained. These lines marked by thefilings are called l{7ies of force, and the whole series themagnetic field of… … Fig. 84.
Physics
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