Christie, Arthur Carlisle, 1879- · Philadelphia ; London : Lippincott · leaf 21
AL OF X-RAY TECHNIC Magnetic Field.—When a bar magnet is placedbeneath a sheet of paper on which are some ironfilings, the filings will arrange themselves in linesradiating from each pole of the magnet as shown inFig. 4. The area surrounding any magnetic body iscalled a magnetic field; it is the… … Fig. 4.—Action of bar magnet on iron filings. Electro-magnetism.—It can be shown experi-mentally that an electric current has magnetic proper-ties ; it will deflect the magnetic needle and will causeiron filings to arrange themselves as they do whenplaced in the field of a magnet. A coil of wire…
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