Elementary lessons in electricity and magnetism (1906)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916, Schwetzky, Otto H. L. [from old catalog] · Chicago, Thompson & Thomas · leaf 110
quite the same thing, for above thepoles the filings stand up nearly vertically to tbif plane 9^ ELEArRNTARY LESSONS ON [chap. ii. 52 and 53, In Fig. 52 the poles are of opposite kinds,and the lines of force curve across out of one pole intothe other; while in Fig. 53, which represents the action… … Fig. 52. Fig- 53. 111. Magnetic Writing.—Another kind of magneticfigures was discovered by De Haldat. who wrote wth thepole of a magnet upon a thin steel plate (such as a saw-blade), and then sprinkled filings over it. The writing,which is quite invisible in itself, comes out in the linesof filings…
Electricity · Magnetism
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