Practical photography : being the science and art of photography, developed for amateurs and beginners (1881)
Wheeler, Owen, 1859-1932 · London : "The Bazaar" Office · leaf 257
ry other good variety of enlarging apparatus) these desiderata are all very neatly fulfilled. The camera, moreover, is mounted on an axis which permits it to be pointed at the sun, and enables the operator to follow the earth's rotation with an accuracy sufficient for all practical purposes. A more… … Fig. 8. Atkinson's Solar Camera. arrangement called a heliostat, which causes it to follow the sun automatically. It must be remarked that in these cameras the size of the condenser is an important element. The larger its diameter, the greater the rapidity of exposure. A diameter of 9in. is about…
Photography
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