A Permanent Record of Lines of Force
المؤلف:
GEORGE A. HOADLEY
المصدر:
ESSENTIALS OF PHYSICS
الجزء والصفحة:
2025-11-26
690
may be made by repeating the above demonstration in a dark room with a ruby lantern for light, and using an ordinary photographic dry plate for the glass plate. The dry plate is placed upon the magnet, film side up, the filings are sifted upon it, and the plate is rapped until the position of the lines of force is clearly brought out. The exposure is made by burning a match about a foot above the plate. On developing the plate in the usual way, a negative is obtained from which may be made prints showing the lines formed by the filings.
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