Rollers Of Machines Research Articles

Improvements in Motion Picture Laboratory Apparatus

A machine for cleaning motion picture film by dry wiping has been equipped with a reservoir and distributing system so as to fit it for application of a cleaning liquid. In order to prevent dust from being carried into the roll when film is rewound, the wind up is enclosed in a box into which filtered air is pumped at a sufficient rate to maintain a forceful discharge stream at the point where the film enters. This stream dislodges dust particles. — In order to have sufficient light on a meter in a darkroom the face of the meter is covered with a metal hood containing a suitable safelight. The meter is observed through a small aperture which permits very little light to escape into the room. Self-luminous finder buttons used as markers in a darkroom can be protected from dirt and corrosion by mounting them in an inverted glass ignition tube which is sealed at the open end with a thermoplastic. — A developing machine roller is provided with frictional driving engagement with the shaft on which it is mounted by the use of spring-held shoes which bear against the shaft. — Oscillation in a mechanical filter in the drive train of a continuous printer has been subdued by the use of Koroseal strips in place of springs and friction damping.