Inside Out Library

I.C.S. reference library : a series of textbooks prepared for the students of the International Correspondence Schools and containing in permanent form the instruction papers examination questions, and keys used in their various courses (1904)

International Correspondence Schools · Scranton : International Textbook Co. · leaf 417

An illustration from I.C.S. reference library : a series of textbooks prepared for the students of the International Correspondence Schools and containing in permanent form the instruction papers examination questions, and keys used in their various courses, 1904, leaf 417 — o 20 ohms. 50. For practical and commercial testing, the standardcolumn of mercury, representing the resistance of 1 ohm, has been replaced by a coil ofwire, usually a platinum-silveralloy. The coil is carefullycalibrated to offer a resistanceof exactly 1 ohm at someconvenient temperature, andis… … §s ELECTRICITY AND MAGNETISM. 39 ohm coils. The commercial form of standard ohm coils isshown in Fig. 3(j.

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