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MORE FROM ARCLAMPS
{Continued from page 15)
ventilation of the lamphouse at these high currents.
For currents of 110-135 amperes it is absolutely essential to have a minimum air velocity through the eightinch chimney opening of the lamphouse of at least 700 lineal feet per minute. This velocity can generally be assured by constructing the exhaust ventilation system according to Fig. 3, using 8-inch diameter pipe or an equivalent
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By Pass
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By Pass
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V
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FIGURE 3
duct size all the way from lamphouse to fan to outside atmosphere.
Type of Fan Needed
Fans should be of the centrifugal type with an 8-inch diameter intake opening. There are several good fans of this type available such as American Blower Model 80-H or Dayton Blower Model 7-C-038. Flow of air and balance between lamps should be regulated by installing a suitable by-pass in each line as shown in Fig. 3. For the Strong Mighty 90 and Super 135, the factory has designed a set of simple gauges to use as a guide to determine if a theatre's present air system is capable of meeting the minimum requirement for the ranges of 75-105 or 110135 amperes. These gauges are available from the factory together with instructions for their use. The gauge indicates only that the draft is meeting the minimum standard required. The maximum draft can be used for any particular amperage is determined by the stability of the arc flame.
The by-pass opening in each lamp chimney duct should be opened a little
at a time if necessary with the arc burning until any unsteadiness of the flame at the crater is eliminated. Do not however open the by-pass to such an extent that the draft gauge for the current you are using will not remain held up into the chimney. Do not attempt to reduce the air flow by restricting the full 8-inch pipe opening, either by the use of a damper or by the use of
smaller pipe. Remove lamphouse damper entirely and reduce air flow by the use of the by-pass only.
Germany Outlaws Nitrate
Beginning June, 1956, safety film will be the required standard in all movie houses in West Germany. It is expected that Austria will take similar action shortly.
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sERVlC€
«S6. is.ni on.
Any wide screen system puts projection equipment to its severest test. Slight picture jump which may pass on a small screen cannot be tolerated on large screens. Your dealer is prepared to show you how your present equipment can be rebuilt to give unexcelled performance and long trouble-free service with genuine £&J^a<^ Projector Parts.
LaVezzi Machine Works
■"■"•"— __ 4635 WEST LAKE ST. C H I C AGO 44. III.
99
irio
Cinema Carbons
ELETTROCARBONIUM
VIA BORGHETTO. 5 — MILANO (Italy)
INTERNATIONAL PROJECTIONIST • April 1956
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