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30
INTERNATIONAL PROJECTIONIST
October 1932
SUPER INTENSITY
AUTOMATIC PROJECTION LAMP
H. C. 10
Super Intensity
Lamp
The
Lamp With Accurate Arc Regulation
and Arc Focusing by Means of
the Heat From the Arc Itself
H. C, 10 Features:
. Self-Starting . Self-Focusing
. Independent Negative Feed Regulation
. Magnetic Stabilization . Better Arc
. Self-Lubricating Bearings
. Weston Ammeter . Carbon Indicator
. Forced Air Cooling . Correctly Shaped Hood
. No Feed Rollers . Full 22-inch Trim
Descriptive booklet on request. Write for it to
HALL & CONNOLLY, Inc.
erable. This kind of effect occurs with film. Before the deposit of emulsion has acquired a "cutting edge," the film is permitted to slide over the deposit rather easily, and there is little probability of damaging the film. But once this smooth surface is changed, by further accretion of emulsion, into a cutting edge, it begins to cut into the emulsion, creating a resistance to the free passage of the film so that the teeth of the intermittent sprocket may tear the perforations in forcing the image past the aperture.
When such deposits of emulsion accumulate and interfere with the free passage of the film over the aperture plate, the projectionist is warned of the situation by the excessive noise made by the intermittent movement in protest against its overload. The projectionist can do only one of two things: either place a lubricant of some kind on the film before it arrives at the aperture plate, or stop the projector and remove the deposit that is causing the trouble. Neither of these procedures is followed by the average projectionist except in emergencies.
Scratches in the emulsion, in the picture area of the film, are nearly always caused by carelessness in handling the film, either in the projection room or in the exchange inspection room, or by. improperly adjusting projectors or allowing dirt to accumulate in them. Long runs of film, made under the best conditions of operation, have indicated that damage due to these causes can be reduced very considerably; but a visit to almost any theatre in which is being projected film that has been booked once or twice before and which has not been properly treated prior to its initial run, will disclose a screened picture marred by many scratches.
The buckling or warping of film is no inconsiderable item of film damage. The buckling or warping is either so bad that the picture cannot be kept focused on the screen, or is insufficient to cause any trouble at all. This kind of difi&culty is likely to occur only with new film, unless the new film has been properly treated to obviate it, prior to its first screening; for it is due to the sudden withdrawal of moisture from the gelatin, or the swelling of the gelatin from being heated by the
24 Vandam St.,
New York, N. Y.
RCA GOVERNMENT ORDER
With upward of 300 battleships, destroyers, cruisers and shore stations equipped with Photophone sound reproducing apparatus, the Navy Department has awarded a contract to RCA-Victor Company for the installation of similar apparatus aboard the U. S. S. Farragut, Dewpy, McDonough, Hull, Minneapolis, Tuscaloosa, San Francisco and Worden. The U. S. Army, with 75 Photophone reproducing equipments in army posts tliroughout the world, also has placed additional orders.