A dictionary of electrical words, terms and phrases (1898)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W. J. Johnston company · leaf 364
givesdirectly the ratio of the conductivities ; so thatby a single reading the magnetic conductivity ofany piece of iron can be compared with that ofthe Norway iron standard. For absolute determinations, the iron is turnedoff into pieces of exactly 4 square centimetrescross-section and 20… … Fig. 3QO. Eickemeyers Differential Magnetometer. Magnetometer, Self-Recording* self-recording apparatus, by means of whichthe daily and hourly variations of magneticneedles in the earths field, at any locality., arecontinuously registered. The self-recording magnetometer employed inthe observatory…
Electricity · Electrical engineering
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