Motography (1912)

October 26. 1912. MOTOGRAPHY 327 Recent Patents in Motography By David S. Hulfish UNITED STATES patent No. 1.034.467. Supporting Frame or Rack for Film or Film-Like Material. Karl Kieser, doctor of philosophy, chemist. citizen of the German Empire, residing at Dusseldorf, Germany. Assignor to Farbenfabriken vorm. Friedr. Bayer & Co., Elberfeld. Germany. Filed October 24, 1911. The inyention relate? to improvements in supporting frames or racks for films. It is well known that //r celluloid film and to a still greater extent non-inflammable films made from acetyl-cellulose have the quality of expanding in contact with water solutions, such as the sensitized emulsion, the deyeloper. the fixing bath, etc., and that on drying they shrink and assume their original length, or may even become smaller. The expansion of celluloid films is generally not great enough to cause disturbances, yet it is adyantageous to give a certain elasticity to the de\eloping frames or deyeloping drums, etc., so that they yield a little when the films shrink and dry. Mr. Kieser proyides the deyeloping or drying frames or similar appliances, upon which the film is wound, with tubes filled with air, so that the gradual expansion of the films in watery solutions can be adjusted by compressing air into the tubes, and when the films are drying, the shrinking is taken care of by the elasticity or compressibility of the air tubes. It is not necessary that means be proyidcd for supplying compressed air to the tubes, nor is it necessary indeed that air-filled tubes be used at all, substitutes being -ible and yet falling within the scope of Mr. Kit claims. In the illustration, which accompanies this review, there is shown a rack suitable for tank development of motographic films. In this figure the frame is comprised of end pieces /. 2. separated by brace and having the film-carrying frame members 5 and /. Upon the members ? and 4 is placed a highly resilient strip 7. For the strip 7 Mr. Kieser prefers to use a thin rubber hose filled with air. the hose being connected to the cock //. The film when it contracts in drying will pull tight upon the air tube and draw it down as shown in the figure, where the film shows that the tube 7 has been compressed until the film nearly touches the cross bars 7 and 4. If desired, a portion of the air within the tube may be allowed to escape through the cock // and thus the tension upon the film may be reduced. The slats of a developing drum or drying drum may be similarly faced with an air tube. The cushion upon the bars which carry the films may be of any yielding substance which resists the action of the solutions into which the film is to be immersed, being an air tube or a thin rubber strip, similar to a window squeegee, or even may be made of two slats, of which one is fixed and the other is movable under spring tension when drawn by the shrinking film. When the carrier is wound with a strip of film which is to be wet subsequently, the film may be wound very tightly so that it compresses the elastic member while. dry and will be kept taut by the expansion of the elastic member as the film expands under the influence of the water. When a wet film, as a film just coated withemulsion in the factory or a film developed and washed! in the studio, is wound upon a carrier, when it is to be dried, it is wound under but slight tension, and as it dries and shrinks the elastic members yield. Patent No. 1,034.833. Projecting Apparatus. Arthur G. Previn. Xew York. X. Y.. assignor to Baseballeon, Inc., a corporation of New York. Filed March 7, 1911. This invention relates to the stereopticon branch of the art of projection. The key to the improvement is the combination of two slides in the same lens field at the same time upon the same screen, one of the slides being fixed and the other being movable or having a movable part upon it. For instance, there may be placed in the slideholder a fixed slide showing a baseball diamond and over this slide may be placed a small movable disk 1.034. representing the baseball. The baseball may be mounted upon a transparent carrier which may be moved as desired. Thus upon the fixed baseball diamond a movable ball may be shown in any position, so that its total movements through the game may be shown by a continuous projection upon the screen before an audience.