Laboratory exercises in physics for secondary schools (1902)
Twiss, George Ransom, b. 1863 · New York, London, The Macmillan company · leaf 125
251 H 291-301 JJ 68-87 T 84-89, 119-121, 126-128, 142 Purpose.—The purpose of this exercise is to de-termine the positions and directions of the lines offorce in the magnetic fields of bar-magnets. Apparatus. — Thisconsists of two bar-magnets, a box of fineiron filings, a sifter,a small compass,… … Fig. 20. MAGNETISM AND ELECTRICITY 97 Part A Operations and Observations. — (a) Place a magnetin one of the grooves and near the centre of theboard. The flat surface of the magnet should notproject above that of the board. Lay the glass orpaper over the magnet and fasten it down with bitsof soft…
Physics
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