Practical applied electricity; a book in plain English, for the practical man. Theory, practical applications and examples (1911)
Moreton, David Penn, 1882- · Chicago, The Reilly & Britton co · leaf 92
by placing a piece of card-board over the magnet or magnets whose field you want toproduce, and sprinkle iron filings on the paper, tapping itgently at the same time. The iron filings are composed ofa magnet material and arrange themselves in the directionof the lines of force or magnetic field,… … Fig. 45 Fig. 46 The parafiine can be heated by means of a warm solderingiron, or other warm non-magnetic material, which permitsthe filings to imbed themselves in the wax and they will belield firmly in place when the parafiine has cooled. The magnetic field that exists between unlike poles isshown…
Electrical engineering
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