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 269
ellow streaks like 1 Sometimes the flash seems to strike downwards from the clouds some-times upwards from the earth. This 13 an optical illusion, resulting from theunequal sensitiveness to light of different portions of the retina of the eye. CHAP. IV.] ELECTRICITY AND MAGNETISM. 251 those shown… … Fig. no. the Leyden jar at the centre of a shellac plate that haspreviously been rubbed with flannel, the negative elec-trification being attracted upon all sides toward thecentral positive charge. Powdered tourmaline, warmed and then sifted over asheet of glass previously electrified irregularly,…
Electricity · Magnetism
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