Practical applied electricity; a book in plain English, for the practical man. Theory, practical applications and examples (1911)
Moreton, David Penn, 1882- · Chicago, The Reilly & Britton co · leaf 319
s-sections throughthis pyramid and perpendicular to its axis are shown at (A),(B), and (C). These three cross-sections and the light (L)are all equally spaced and, as a result, the cross-section (B)is four times that of (A), and (C) is nine times that of (A),etc., or the cross-sections between the… … 4^ Fig. 249 Fig. 250 versely as the square of the distance from the source of light. The Bunsen photometer is one of the oldest and simplestforms of photometers and also one of the most eflScient meansof comparing the intensities of different sources of light. Theconstruction of this photometer can…
Electrical engineering
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