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Fig. >: The modified 35/70 mm \L projector and I entarc lamps ititli the liquid heat filter, all threaded and ready for a 7') mm. Projection at the Midway Drive-In in San Diego.
In the Research Council, built .mil installed b\ MancoVision.
Figure 1 shows a daytime picture ol the Midwaj Drive-in and MancoVision screen for a picture <>f 102 ft. bj II ft. Even though (hi> \\a> one of the first screen installations of this kind, it is in excellent condition and has retained a gain of 2.5 plus. The 70.MM picture of 102 l>\ 1 1 ft. had a center brightness of lit foot-Lamberts.
As shown on Figure 2. be operates with modified KL-projectors and Strong Ventarc lamps. These lamps are equipped with 21 in. silver mirrors and for the projection of both his 35MM and 70MM prints he uses the D -j F liquid heat reducing filters with dichroic coatings, also a Research Council development, and shown directly mounted on the lampbouse on (he side-view of Figure 3.
Needless to say that this liquid filter is recommended for all high power installations, since its heat absorption is the most effective known so far and will not only protect the 35 and 70MM prints but eliminate focus drift as well. Another view of such filter installation is shown on Figure 4. and the liquid heat filter itself is seen on Figure 5.
I For the more interested reader 1 would like to refer to my article "Research Council Development for
Better Theater Projection," by Walter Beyer, in the Journal of SMPTE. November 1960 pages 792 through 794.)
In the North Star Drive-In theater in Denver, Colo., which belongs to the Wolfberg Theaters, Inc. we projected with 70MM a picture of 135 ft. by 60 ft., having a center brightness of 12-foot-Lamberts.
This Drive-in operates with Philips Norelco projectors using again the
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Fig. 5: A close-up of the liquid heat filter. The filter is only ~/%" thick ".ml does not interfere with light beam and distribution over aperture.
International Projectionist December, 1964
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