A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 1061
ale in the eyepiece. The rate at which the image of the leafpasses the divisions of the scale is then a measure of the rate ofleak to earth of the charge upon the leaf, and this in turn is ameasure of the conductivity of the air, or the ionisation due to therays entering the chamber. If a minute… … Fig. 985.—Effect produced by thorium upon a photographic plate. The photographic effect of the rays from thorium may be shownin an interesting manner. If an ordinary incandescent gas mantlebe placed in contact with a photographic plate and left for abouta week, then on developing the plate the…
Physics
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