Elementary lessons in electricity & magnetism (1895)
Thompson, Silvanus P. (Silvanus Phillips), 1851-1916 · New York and London, Macmillan and co. · leaf 63
immediately in front of them drives the mill round inthe direction opposite to that in which the points arebent. It will even rotate if immersed in turpentine orpetroleum. If the points of thefly are covered with small roundlumps of wax it will not rotate,as the presence of the wax pre-vents the…
Electricity
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