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20
MOTOGRAPHY
Vol. V, No. 4.
Recent Patents in Motography
By David S. Hulfisk
NO. 973,961 and No. 973,962. Method and Means for Projecting Motion Pictures in Natural Colors. William E. Oliver, Washington, D. C, assignor to, The Oliver Tri-Chromatic Company, of same place.
Two patents for a system using the simultaneous projection of trichromatic images in motion pictures whereby colored pictures are produced upon the screen
Fig.l.
973,961.
by a black-and-white picture positive produced by direct photography from nature. The three images for the three primary colors for projection at the same time are arranged side by side upon the picture film, but the width of the film is not mentioned in the patent.
The full descriptive text of patent No. 973,961, aside from laudatory remarks, is as follows :
Figure 1 is a diagrammatic view showing the general arrangement of the lenses, screens and prisms. Fig. 2 is an elevational view of the projecting apparatus showing more particularly the relation of the tri-colored film and the lenses; and Fig. 3 illustrates the film.
Referring to the drawings, L, L', L2, indicate the lenses, whereof the last two are adjusted by any suitable means (not shown) for minute angular adjustment. The prisms P, P', P2, are under like control.
N, indicates an appropriate shutter with openings O, which are opened and closed in any suitable manner.
G, indicates the gate or window at which the film or tape F, pauses at the moment the openings O, in the shutter are opened.
Y, indicates a source of light that illuminates the photo
973,961.
graphic images, X, the condenser, and S, S', and S2, are the color screens which filter the light from the condenser before it passes through the film.
M, indicates the display field or screen which presents the picture in natural colors.
By adjusting the reflected prisms P, P', P2, upon their axes, the light rays which are diverged and reflected may be directed into line, with the optical axes of the lenses L', and L2, after these have been adjusted to accurately superpose the three images upon the screen, which is, of course, essential in producing a unitary composite picture. It will be appreciated by those skilled in the art, that the focal distances between each of the images, F, F', F2, of the film and the three lenses must be the same in order that the three pictures shall be in focus upon the screen simultanously and in order that the images shall be identical in dimensions so that they may be accurately superposed, these features being absolutely essential to the production of a single composite picture and the synthesis of the three colors. I am enabled to accomplish these ends by diverging the light rays of the colors upon either side of the central color, between the film and' the lens, so that the central lens may be placed at a slightly greater distance from the film than the side lenses, the paths of the light from the film to the three lenses being thereby made equal. This also provides for equal illumination of the three images since it is essential that the path of light from the condensing lens X to each of the lenses shall be uniform in order that the maximum light may be focused upon each lens to obtain