The Bioscope (May-June 1912)

The Bioscope, June 27, 1912. 947 Latest Inventions. Complete Specification. _ 21,261, 1911.—Date of application, September 26, 1911. Complete specification left, March 19, 1912; accepted May 23, 1912.—Improvements in or relating to kinematograph apparatus for the production of coloured pictures.—John Campbell, D.Sc., Ph.D., 59, Gartmoor Gardens, Wimbledon Park. a Hn nt ru : Ty 4 Wie ii i if S \ S BERT BERXQ,{ 6 N > \ Ing \ ahs ° i ih Hi This invention relates to improvements in kinematograph apparatus for the production of coloured pictures, and it refers more particularly to positive kinematograph films of the kind wherein the colour screens for projection are integral with the positive film. According to this invention the colour screens are made part of the actual positive by adhesively fixing or attaching thereto in proper alternating or recurring order either a plurality of separate transparent coloured slips, films or screens of the required complementary colour, or two or more continuous bands of complementary colour which are suitably cut away or fenestrated in ladder like fashion so as to expose through the spaces therein, when assembled, the next or adjacent screen or screens in the proper order in relation to the black and white pictures. The invention is hereinafter described with reference to the accompanying diagrams in which :—Fig. 1 shows detail views of the coloured screens or films and the positive . film to which they are to be attached.” Fig. 2.is a diagram showing suitable apparatus for use in their manufacture ; Fig. 3 is a similar view to Fig. 1 illustrating a modified method of manufacture; and Fig. 4 is a similar view showing apparatus for use therewith. J For two coloured kinematography these slips are conveniently prepared as follows :— Digitized by Gor gle WHAT INVENTORS ARE DOING FOR PICTURES. In Fig. 1 a represents a film consisting of gelatine, celluloid or ‘like material with which a complementary colour (say red) has been thoroughly incorporated while in the semi-liquid and plastic state by well known methods of manufacture. This film is the exact size of the ordina kinematograph black and white positive film ¢ to be coloured and is perforated at a! along its side edges by the same machine as the positive film on which the slips have to be superimposed. By suitable joins the coloured film may be made of any desired length. By means of a suitable machine this perforated film is cut across where indicated by the dotted lines d givin slips the exact size of the kinematograph picture with lateral perforations a! coinciding with the corresponding perforations ¢! in the black and white positive c. Every alternate slip of the screen a, indicated by the even numbers 2, 4 etc., is rejected. , In a similar way the slips are cut from a green film } perforated at b! by the same machine as the red film a, but here the odd numbers are rejected. As the slips are cut they are alternated viz. odd red, even green, and so on until the films are all cut. We have now a series of coloured slips 1, 2, 3 etc., alternately red and green. Before cutting the coloured films they are registered as shown in Fig. 1 so that the appropriate slips of the coloured screens coincide with the proper black and white positive picture as regards the perforations. The black and white positive ¢ is now run over a sprocket drum (Fig 2) back upwards, and as it is fed over the sprocket the appropriate slips from a b are also fed on to the corresponding positive pictures by hand or other suitable means care _ being taken to see that the first coloured slip used is ac curately registered to its correct position on the positive film ¢ so that the perforations q@! 1 thereon correspond to the similar perforations c1 of the said positive film. It follows that all succeeding slips will then be in the proper sequence for adhesion to the positive film. The film is thus backed by complementary coloured slips which are part and parcel of the film itself. In the suitable arrangement for this purpose shown ‘n Fig. 2, e indicates the film box receiving the finished film through the two rollers f g which move reversely, smoothing and fixing firmly the slips a b on the film c. A sprocket drum h exactly coinciding with regard to the teeth in dis tance and size with the film perforating machine pulls the film ¢ over at a suitable rate, on to which the alternate red and green slips are fed. OAgHoueré)lightly brushes on the NEW YORK PUBLIC LIBRARY