Lessons in practical electricity; principles, experiments, and arithmetical problems, an elementary text-book (1902)
Swoope, Coates Walton. [from old catalog] · New York, D. Van Nostrand company · leaf 70
flected,and at the expense of the zinc rod. Exp. 7 With the wire arranged as in Exp. 6, interpose pieces oftin, steel, copper, iron, lead, gold, brass, aluminum, etc., betweenthe connecting wires, and the needle is deflected as l3efore. Whenpieces of paper, glass, wood, mica, etc., are interposed,… … 52 PRACTICAL ELECTRICITY. not attract them. Wind a few turns of cotton-covered wire aroundthe iron rod and plunge it into the filings, after first connecting theends of the wires to the two plates in the tumbler. Filings are nowattracted to the iron core, but drop off when the connection to…
Electricity · Magnetism
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