Dental and oral radiography : a text book for students and practitioners of dentistry (1916)
McCoy, James David · St. Louis : Mosby · leaf 37
difference is observed. They both attract theiron filings. There is a difference, however, which 34 DENTAL AND ORAL RADIOGRAPHY may be shown by experimenting with two mag-nets, one of which should be suspended at its cen-ter like an ordinary compass, while the other isheld in the hand. If the north… … Fig. 5. The action of iron filings in forming definite curved lines about an ordinary bar magnet indicates that the magnetic field exerts its influence in certain definite directions which are called the magnetic lines offorce. north pole of one be placed near the south poleof the other they will…
Radiography, Dental · X-rays · Teeth · Mouth
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