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1953-54 Theatre Catalog, 11th Edition, Page 283 (247)

1953-54 Theatre Catalog, 11th Edition
1953-54 Theatre Catalog
1953-54 Theatre Catalog, 11th Edition, Page 283
Page 283

1953-54 Theatre Catalog, 11th Edition, Page 283

completely refinishing the reflector, including a new rhodium plated reflective

surface which returned the merchandise to its original condition.

With rehabilitation, therefore, it was possible for the exhibitor to keep his metal reflectors in top working condition almost indefinitely. After 10 years of

very successful performance records, the manufacturer decided that the merchandise could carry a five year guarantee in place of the original one year guarantee.

Another innovation, was the pin hole plate, for use in aligning the lamp and projector. When checking alignment with the pin hole plate, the lamp and projector became an optical testing device, identical in operation to factory optical testing equipment. However, instead of testing the reflector with this arrangement, it is used for setting up a true axis of the entire optical train, or, in other words, obtaining accurate optical alignment of the arc, reflector, aperture and objective lens. The original design was for use in place of the standard film aperture plate. The newest type is used in the film track so as to be on the film line, and has been renamed the film track pin hole plate.

With the plate in place in the projector, the small pin hole is dead center of the aperture opening, and passes only the correctly focused light of the arc, to be focused by the objective lens into an image of the redectorls surface, a short distance in front of the lens. This is called the aerial image, and it is the manner in which the circular color bands can be made to appear in this image, that determines optical alignment.

Print E shows the appearance of this small (approximately two inch diameter) reflector ftaerial" image. The shadow image within the aerial image is made by the positive guide rest and negative carbon. When alignment has been completed, and all color bands are removed

ONE OF THE FINAL STEPS IN the manufacture of metal motion picture reflectors is electroplating rhodium which is the last of the reflective


PRINT E SHOWS THE appearance of the aerial image of the reflector. When alignment has been completed. image will appear fully illuminated.

by focusing the arc, the reflector "aerialll image will appear full and evenly illuminated, providing that the reflector is of precision elliptical curvature. Any departure from true elliptical curvature will show as color in the aerial image, and it will be impossible to clear it out.


With the coming of the drive-in theatre, and the larger, even more volatile arcs needed to illumniate the enormous screens, the metal reflector became practically a nmustfl The terrific lamp heat, the ffupll angle of projection and the cold night air drafts, created new wear and tear problems.

Then the drive-in headache was enlarged upon by the construction of bigger

drive-ins with even larger screens and again, the problem of sufficient illumination of the picture.

Larger higher intensity carbons were developed, and this was followed with larger projection arc lamps that used correspondingly larger redectors. These developments helped solve the screen illumination problem, but had added to breakage and general deterioration of the back-silvered reHector. It was soon evident that somehow more light must be had with a metal reflector. Here again the makers of metal reflectors came forward and introduced their new aluminized metal reflector. It was the answer to the drive-in reflector problem. It was not only dependable and economical, but it delivered top screen light as well. In addition to the job it is now doing for the drive-in, the aluminized metal reflector is fast becoming a 3-D must.

Extensive research had shown that the only available reflective material which would be practical on a front surface reflector, and that would have more renectivity than rhodium, was aluminum. Standard methods of aluminizing had to be somewhat revised, to suit this particular application, and thereby able to withstand the damaging effects of these new high intensity arcs.

On the basis of carefully conducted laboratory and field tests, this new aluminized metal reHector has 15 per cent more reflectivity than its counters part, the standard rhodium metal reflector, and three per cent more delivered screen light than a selected back-silvered reflector.

To sum up this new development in the renector field, it is sufllcient to say that the aluminized metal reflector not only guarantees maximum economy and dependability, but also top delivered screen light.

surface finishes. Reflectors, such as those on the rack. have provea themselves to be very acceptable for use in the prowction of matron pictures.
1953-54 Theatre Catalog, 11th Edition, Page 283