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negative. The positive carbon lies horizontally along the optical axis and the negative electrode is so placed as to direct the light rays straight along this axis to the condensing lens.
An Automatic Arc Control.
A single motored projection arc control has made its appearance on the market. This control is marked by its absolute simplicity. It consists of a magnet connected across the arc terminals through a suitable resistance. The armature of the magnet coils is normally held away by an adjustable spring, the latter being adjusted after the proper arc setting has been determined upon. When the voltage across the coil increases the armature is attracted toward the magnet coil, and in so doing, completes the feed motor circuit. The motor, working through a gear ratio of about 800 to 1, feeds the carbons together until they reach a position where the voltage is insufficient to hold the armature against the spring tension. The latter, therefore, causes the armature to break the motor circuit.
Camera Motor.
A manufacturer of motion picture cameras has successfully designed a small compact motor for operating cinema cameras. To be successful, such a motor must be exceedingly accurate in balance so that there will be no vibration present. With this motor in use and operated from a storage battery, the cinematographer is able to give his entire time to the task of keeping his scene in its proper place in the frame.
Color Studies,
Although not technical in its methods of application, it is interesting to note that some of the larger producers of film have been brought to recognize the value of properly preparing the tones of scenes and sets in order that the correct color values and relations may be evidenced on the final black and white screen picture. Color experts are now brought into consultation when lavish sets are being prepared.
Fireproof Structures for Exchanges.
Through the efforts of the various Fire Protective Associations and the film manufacturer, special structures to house film exchanges have been erected or are being erected in the distributing centers of the industry. Many of the older Exchanges represented fire hazards of the worst type. The new buildings are fire-proof in every particular, and have been built to incorporate the ideas of those most experienced in the handling and storage of film.
A. R. Dennington, Chairmen.
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