International projectionist (Jan 1963-June 1965)

Record Details:

Title:
International projectionist
Date:
Jan 1963-June 1965
Publisher:
New York : International Projectionist Publishing Co., Inc.
Volume:
International projectionist (Jan 1963-June 1965)
Leaf #:
000434
Language:
English
Collection:
Technical Journals
Format:
Books
Contributor:
Library of Congress, MBRS, Moving Image Section
Sponsor:
Library of Congress, Motion Picture, Broadcasting and Recorded Sound Division
Coordinator:
Media History Digital Library
Description:
International Projectionist presented the technology of cinema sound and image projection while addressing the issues and concerns of union projectionists. -- David Pierce, 2013
Date Added:
September 21, 2023
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Fig 2: Another illustration of the Midway Drive-In in San Diego, Calif., showing 35/70 XL installation using Venture lamps. Strong Ventarc lamp — in this case with a 21-in. Balcold mirror. Figue 6 shows the booth of the Northstar Drive-in. Their screen is a very unique new design consisting of corrugated steel sheets that have been galvanized — after which several coats of a special white paint are applied. In both cases, the Manco-Vision. as well as the corrugated sheet metal screen, have excellent horizontal light distribution over the entire parking areas of the Drive-Ins. These tests have proven, beyond any doubt, that 70MM prints, as used in Hard-Top theaters, require absolutely no change for running in Drive-Ins, which is of special interest in regard to six-channel sound, as it can be picked up magnetically just as in the indoor houses. The sixchannel reproduction also enhances the sound outstandingly even through the single speaker. With the equipment, as described above, the center screen brightness in 70MM, both 18 and 12 foot-Lamberts, represents an unbelievable achievement for a Drive-In picture. One should not forget that the brightness recommendation for a 70MM print indoors is not more than 1 5-16 foot-Lamberts. In both cases the impact of having a picture with such brightness outdoors is beyond description. It (Continued on page 14) 70/35MM TESTS AT MIDWAY DRIVE-IN THEATER IN SAN DIEGO Data Motion Picture Research Council aluminum screen — gain approximately 2.5 (1/3 of panels on right side of screen slightly darker.) 102 x 44 feet — 4,488 square feet. 473 feet. Modified XL projector heads with indoor shutter blades, 50% efficiency. Strong ventarc lamp with 21 inch silver mirror burned at 130 amps, 73 volts. 1 Porthole glass; absorption approximately 11%. 1 Liquid heat filter with dichrck coating; absorption approximately 14%. Focal length 5 inches, speed f:2, Bausch & Lomb. Focal length 4 inches, speed f:1.5, Super Kiptar (Isco) plus anamorphic attachment. Focal length 8 inches, speed f:2.2, Kollmorgen. Technical Screen: Screen Size: Throw: Projectors: Light Source: In the Projection Beam: In the Light Beam: Lens for Wide Screen: Lens for Cinemascope: .715 x .868 Lens for 70MM: SCREEN BRIGHTNESS READINGS IN FOOT-LAMBERTS 1) 35MM Cinemascope Readings: Left Center Center Right Center 8.0 8.0 6.0 7.5 7.5 5.0 8.0 7.5 6.5 7.5 Average 7.37 Average 5.5 Average 2) 70MM Readings: Left Center Center Right Center 10 19 8.5 8 17.5 8.5 17.0 16.5 9 Average 17.5 Average 8.5 Average Distribution approximately — 51% We are mainly concerned with the 70MM situation, and assuming that the 102 by 44 ft. screen image is as close in information as we can get it, I have calculated backwards using the 8 in. focal length of the lens to determine the 70MM aperture size. This aperture was approximately 1.740 by .744. In order to determine the luminous flux in the center of the image, the basic lens from his CinemaScope setting having; 4 in. focal length but being of a speed of f:1.5, contrary to the 8 in. f:2.2 lens as used during the measurements and showings, several renter readings on the screen were made; and an average of 7.75 foot-Lamberts was re^d (average of two readings — 7.5 and 8.0). The 4 in. lens would have equalled a picture size of 204 by 88 ft., or 17.952 sq. ft. If we consider a screen gain of 2.5, the 7.75 foot-Lamberts correspond very roughly with 3 foot candles ?s identical to 53,856 lumens. Since we had in 70MM a 50% distribution, which with t]he 4 in. lens may even have been worss due to lens fall-off, it looks as if the total luminous flux over the entire aperture area was verv nearly 27,500 with the shutter running which clicks closely with 55.000 lumens of factory output rating. CARBON ARCS . . for finest Projection . . . Compact Xenon Arcs Brighter Light on Screen • Longer Burning per Carbon * More Economical jeTRON products CARBONS, INC. Xemoss LAMPHOUSES • by Cinemeccanica BOON TON, N. J. LsTgiggg POWER SUPPLIES by Christie International Projectionist December. 1964