An elementary book on electricity and magnetism and their applications (1919)
Jackson, Dugald C. (Dugald Caleb), 1865-1951, Jackson, John Price, b. 1868, Black, Newton Henry, b. 1874 · New York, The Macmillian Co · leaf 554
(Fig. 348). A rise of temperature of onemillionth of a degree will generate currentenough in the loop to cause a deflection of onescale division. This instrument is called theBoys radiomicrometer and will detect theradiant heat of a candle two miles away. 341. Pyrometer. To measure the tem-perature… … Bismuth~A\rAntimony Fig. 348. — Boys radio-micrometer.
Electricity · Magnetism
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