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 520
Fig. 327. — Distribution of light. Curve Awithout shade, curve B with shade. ELECTRIC LIGHTING 465 … Fig. 328. Distribution curves for a magnetite arc; A, lamp alone, B, withproper devices. 318. Measurement of illumination. In these days when wedo so much of our work and play by lamplight the problem ofillumination is a very vital one. In the first place, it is essen-tial to have enough light to…
Electricity · Magnetism
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