A laboratory course in experimental physics (1896)
Loudon, W. J. (William James), McLennan, John Cunningham, joint author · New York and London, Macmillan and Co. · leaf 84
applicable in finding the in-tensity of the light from an incandescent lamp, or that from anelectric arc. The intensity of the latter should be examinedwith the carbons making different angles with the vertical,because, just as in the case of gas flames and incandescentlamps, the intensity at a… … Fig. 49. ence of luminous sensations, is the same as if the retina receivedthe impressions from the different objects simultaneously; andit is for this reason that we are able to produce a white appear- 74 EXPERIMENTAL PHYSICS. ance by the rapid rotation of a disc of coloured sectors arrangedin…
Physics
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