. The book of photography; practical, theoretical and applied. er, and their angles may be variedby means of screw rods at H and i. Thecentral miri-or G is silvered on both sides,and turns on vertical centre pivots. Sup-posing the subject to be photographed issituated at d, one exposure is made, whenthe course of the light wil be d to E, E toG, and G to the plate c. The first platethus exposed, the central mirror G takesa quarter turn, so that, when the secondexposure is made, the light received by Gcomes from an opposite point F, and isdeflected to the plate c as before. If thesubject stands
. The book of photography; practical, theoretical and applied. er, and their angles may be variedby means of screw rods at H and i. Thecentral miri-or G is silvered on both sides,and turns on vertical centre pivots. Sup-posing the subject to be photographed issituated at d, one exposure is made, whenthe course of the light wil be d to E, E toG, and G to the plate c. The first platethus exposed, the central mirror G takesa quarter turn, so that, when the secondexposure is made, the light received by Gcomes from an opposite point F, and isdeflected to the plate c as before. If thesubject stands at a greater or lesser dis-tance than D from the camera, the mirrorsE and F are adjusted accordingly, so thatthe image emanating either from E or ffalls upon the centre of the plate c. Xeedless to say, mechanical communica-tion exists between the plate changingdevice, the shutter, and the turning of themirror G, so that the complete operationof making the two successive exposuresmay be accomplished in a very short spaceof time. From these facts it is evideat. Fig. 827.—Theodore Browns StereoscopicTransmitter. that this system is very near to that ofsimultaneous exposures, which will nowbe considered. Stereoscopy with One Lens, OneExposure. The inventor of the last mentioneddevice was also the originator of theinstrument termed the Stereoscopic D •; ---?
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