Electricity for public schools and colleges (1891)
Larden, W. (Walter), b. 1855 or 6 · London : Longmans · leaf 124
Fig. iii. Fici. iv. lying parallel to the sparks of which they are the images, asrepresented in fig. iii. But when the mirror revolves with sufficient rapidity, we seethese points drawn out into three lines of equal length, coveringa number of degrees on the glass screen that is definite for…
Electricity
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