. The book of photography; practical, theoretical and applied. Fig. 821.—Double Slottkd Board. of the lens is found, thus dispensing withthe need to examine the screen of thecamera between the exposure of the firstand second plate. Other Methods Available for One-lensWork. A very similar apparatus is that illus-trated in Fig. 821. In this case the boardis not moved between the exposures, but,instead, the camera is removed from the (il8 THE BOOK OF PHOTOGRAPHY. slot D to the slot E, the board itself being-attached to the tripod at A. At b and cdetachable squares are provided, wherebythe proper
. The book of photography; practical, theoretical and applied. Fig. 821.—Double Slottkd Board. of the lens is found, thus dispensing withthe need to examine the screen of thecamera between the exposure of the firstand second plate. Other Methods Available for One-lensWork. A very similar apparatus is that illus-trated in Fig. 821. In this case the boardis not moved between the exposures, but,instead, the camera is removed from the (il8 THE BOOK OF PHOTOGRAPHY. slot D to the slot E, the board itself being-attached to the tripod at A. At b and cdetachable squares are provided, wherebythe proper position of the camera for eachpicture may be detei-mined. A stillsimpler form of stereoscopic head is shownin Fig. 822. The camera is attachedeither at B or c and removed between thetwo exposures to the opposite end. Thismethod does not provide for variation. Fig. 822.— Tripod He.\d for Oxe-LensWork. of distance between the two points fromwhich the stereoscopic pictuies are apparatus, termed the StereoscopicTray, is shown in Fig. 823, and is in-tended to be used for stereoscopic workwhen a hand camera is employed. Thecamera, indicated by the dotted lines, isplaced at one end of the tray. An ex-posure is then made, and the cameraremoved to the opposite end for thesecond exposure. The distance betweenc, c, being somewhat less than the dis-tance between B, b, the axis of the camerain the two separate positions is such that
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