Living pictures; their history, photoproduction and practical working. With a digest of British patents and annotated bibliography (1899)

16 LIVING PICTURES. Fig. 12. in the same direction at the same speed (Fig. 12), and though this form of apparatus did not make its com- mercial appearance till some- what late in the day, it will be seen from the drawing that the arrangement is exactly equivalent to view- ing the back of a slotted disc in a mirror. It, how- ever, opened the way for further improvement by ex- hibiting clearly the shutter- like nature of the slotted disc. The first attempts at projection were founded on this type of machine, the design wheel being transparent and light thrown first through it, then through the slots, and finally on to the screen by means of an objective. This was done by Uchatius between 1851 and 1853, but Plateau himself had practically attacked the same problem in 1849 in a modification of his Anorthoscope. It will be remembered that the Anorthoscope produced four non-distorted images from a distorted original. Plateau placed sixteen images in progressive series round the margin of a glass disc, and in front of this, in a reverse direction, revolved, at a four times greater speed, an opaque disc with four slots. The front of the apparatus could be observed by many people at once, and to prevent confusion the parts of the disc showing the non-erect images were screened off. It will be seen that as a slot passed the aperture in the screen one image would be viewed and the light then cut off while the transparent disc turned one-sixteenth of its diameter and the opaque one one-quarter. The next image would then be revealed, by its coincidence with