Motography (Jul-Dec 1914)

Al GUST 1. 1914. MOTOGRAPHY 175 Recent Patents in Motography By David S. Hulfish Patent No. 1,053,946. For an Improved chronizing Device. Issued to Leon Gaumont, France, assignor to Societe des Etablissements mont, Paris. France. Application filed Ian. 4. SynParis, ( ',:a\ 1907. The phonograph B is driven by the constantly running motor D through the connecting slip-belt C. The phonograph is made ready to start but is held motionless by the stop-latch 44, controlled by the electromagnet 43 in turn controlled by switch point 41 and switch lever 40. The motor 25 of the kinematograph projector A has an external commutator. It is shown as a multipolar motor with a bipolar armature, and the field coils are connected through the group of conductors 5J to terminal points 52 upon a part 52a of the phonograph B which carries a commutator driven by the phonograph mechanism. As the armature of the motor 25 has its speed controlled absolutely by the magnetic rotation of its fields, and as the fields are controlled by the commutator in connection with the phonograph driving mechanism, it follows that the kinetoscope motor must keep exact pace with the phonograph, and a perfect film in the projector, once placed in synchronism with the phonograph, must necessarily remain in synchronism. No. 1,055,492. For an Improved Kinetoscope. Issued to Alvah C. Roebuck, Chicago, 111., assignor to The Enterprise Optical Mfg. Co., Chicago, 111. Application filed April 21, 1909. From the patent as issued : This invention has for its principal objects, first, to provide an acceleration in the speed of the film feeding drum during the period in which it is imparting intermittent feed to the film, and thus attain a relatively shorter period of the film movement and a correspondingly increased period of film rest during each cycle of the film movements. Second, to provide a tension mechanism for the picture film at its point of exposure which provides a minimum degree of tension at the beginning of the movement of the film and an increase in such tension after the film is in movement. Such increase in tension reaching its maximum when approximately three-fourths of the movement has taken place, and bo continuing for approximately one-quarter of the cycle of the feeding mechanism to allow the film to become steady after its movement, the tension then gradually decreases until the minimum point is reached ready for a fresh cycle of the operations just described. With the described variations of the tension the tendency of the film to continue its movement after the feeding mechanism stops, is very effectually prevented. The feature of acceleration of driving drum speed during the shift is obtained by introducing into the driving train the swinging arm 29 carrying its pinion gears 24 and 26, the arm 29 being given a small swinging movement by action of the cam 28. This swing of the arm 29 increases the drum speed during the shift and compensates by retarding the speed immediately thereafter. The feature of variable film tension is obtained by placing the cam 57 upon the pin wheel of the Geneva movement, the cam J7 operating through friction roller jp to lift the member j5 which lifts the tension of the springs in the film gate. No. 1,056,794. For an Improved Photographic Printing apparatus for Moving-Picture Films. Issued to Albert S. Howell, Chicago, 111., assignor to Bell & Howell Co., Chicago, 111. Application filed March 6, 1909. The illustration shows a side view of a printing machine for making a moving picture positive picture film from a moving picture negative film. At the top, reel 23 contains the sensitive film and reel 24 contains the negative. At the bottom, reel 29 takes up the printed film and reel 50 takes up the negative. An electric lamp within the casing 40 passes light through the negative upon the sensitive film as the two pass together in front of the lamp house. A lever 78 adjusts the amount of light, which must be varied as the negative varies, etc., and the relative printing strength of the light are indicated upon the scale /p. ',055,491. With these details in mind, the following two claims, selected from the 21 claims of the patent, will be understood and also will serve to explain the invention :