. The book of photography; practical, theoretical and applied. xample of Motional Perspective. relative distance of the two these facts it will be seen that,by the proportionate displacement of ob-jects in a composition, their relativespeeds, the sensation of relief may begained from a series of flat projectionsupon a screen. Whether the subject isanimated or stationary, displacement ofobjects in proportion to their supposeddistance from the observers eye willbring about the desired sensation of reliefwhen a series of pictures successively sodissimilar are projected upon a s
. The book of photography; practical, theoretical and applied. xample of Motional Perspective. relative distance of the two these facts it will be seen that,by the proportionate displacement of ob-jects in a composition, their relativespeeds, the sensation of relief may begained from a series of flat projectionsupon a screen. Whether the subject isanimated or stationary, displacement ofobjects in proportion to their supposeddistance from the observers eye willbring about the desired sensation of reliefwhen a series of pictures successively sodissimilar are projected upon a screen inrapid succession. Browns Method of Relief Projection. In nature there is a constant oscillationof images upon the retinae of the two eyes as the observer makes the various axial ad-justments necessary to bring all planesunder especial attention. The oscillationof images upon the retina, however, isrendered more or less unnoticeable by thesimultaneous focal accommodations thatare operative during the process ofbinocular vision, throwing each plane out. Fig. 854.—Cinematograph and MechanlsmFOK Oscillating Subject. of focus as the attention is diverted to adifferent one. To make the illusion ofrelief from a lantern projection moreperfect, it becomes necessary to utilisephotographic means, and this may bedone for stationary or moving a stationary subject, such, for in-stance, as shown in Fig. 853, is prepared,a series of pictures composed of the twoextreme views shown in the illustration,together with a number of intermediatephases, will have to be secured. The sub-ject is placed upon a stand or shelf, atright angles to which a background is 636 THE BOOK OF PHOTOGRAPHY. fixed. This background is hinged at theback and in the centre to some rigidsupport, such as a post. The background,with its attached shelf, forming a tableon which the articles are set up, may thusbe oscillated on its vertical hinges like themovement of an ordinary door. The frontpart
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