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34
Motion Picture Projectionist
February, 1932
Good Projection
Requires
Good Rectification
M. P. 25-25
Good Rectification Means
Forest Rectifiers
THIS Forest Rectifier meets the demand for a single unit to supply direct current for two projectors, and will furnish 15 to 25 amperes to either projector continuously.
It supplies a steady direct current, free from pulsations, and will produce a better light than other current supply devices. The only wearing parts are the bulbs which will last at least one thousand hours and usually much longer since only two bulbs are being used at a time (except during change over) and the load is alternately carried first by one set of two tubes, then the other two, as the projectors are alternately used.
This Forest Rectifier embodies the use of four rectifier tubes which are connected to supply current to two direct current circuits independent of each other, thus preventing loss of current at the first arc when the second arc is struck.
Both arcs can be operated at the same time during the change over period and there will be no diminishing of the light from one projector while lighting up the second.
Two Ammeters are mounted on the unit which will show at a glance the amperage being used at either arc.
Links are provided for operating from 110-220 or 240 volts.
Rectifiers for all purposes made in 15 amp., 25-25 amps., 30, and 65 amps, sizes.
We are specialists in our field. Send us your technical problems. Literature on request.
Forest Electric Corp.
New and Wilsey Sts.
Newark New Jersey
Foreign Experimenters Work on Cellophane Film Development
American producers are manifesting considerable interest in the report that film companies abroad are experimenting with cellophane as a substitute for regular film stock. Interests in this country, it is said, have already started an investigation to determine what progress has been made toward perfecting the process.
According to information available at the present time, attempts to use cellophane have not been successful and much research will be required before substitution can be considered practicable. The official report runs as follows:
"The image on this film is not obtained from a silver emulsion, but from the action of light and a combination of dyestuffs. After printing, which requires a very intense light, and even then is rather slow, the film is developed with ammonia gas or some related compound. The final image, purely a dye image, has not, according to our information, approached in photographic quality that obtainable from the regular silver emulsion type of film.
"In some demonstrations which have been given in Europe, a great deal of trouble has been encountered in keeping the image from floating up and down on the screen during the course of projection."
HIGH SENSITIVITY
is a prime feature of Visitron Photoelectric Cells which means
brilliant sound reproduction. A comparison with ordinary cells will prove it. Ask the National Theatre Supply Company salesman.
LABORATORIES |N<
1733 Belmont Avenue Chicago,
PHOTOELECTRIC CELLS
TSTTRUN
REG. TRADE MARK
BE PREPARED!
TELEVISION
THOMAS
BENSON
TELEVISION
For the
PROJECTIONIST
A COMPACT little book, complete with illustrations and diagrams, embracing the basic fundamentals of television instruments used in television today. It is a book both for the interested layman and for the craftsman who will shortly depend on television operation for his livelihood. It has been written especially for the motion picture projectionist who will unquestionably operate television in the theatre as he now does sound equipment. The serious projectionist will get a copy at once.
Some of the Contents
— Elements of Visual Communication — Light Sensitive Cells — Scanning Methods
— The Television Signal and its Amplification — Transmission Channels for Television — Light Sources for Television Reception — Reproducing the Image — Synchronizing Methods — Stereoscopic and Color Television — Experimental Television
TELEVISION
By Benson $2.00
SEND THIS COUPON TODAY
Mancall Publishing Corp.,
7 West 44th Street, New York City
Enclosed find money order for $2.00. Please send me Benson's Television.
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Address
City and State. Theatre