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Your concessions may delight gourmets. . .
Your lounge may be the smartest. . .
BUT
EVERY PERFORMANCE STILL
MUST BE PERFECT!
First matinee or midnight show, perfect performances demand equipment that runs like a top. There's no expert like an expert RCA Theatre Service Engineer to keep everything humming. He’s the only man with full backing of RCA’s long-famed technical resources.
RCA SERVICE COMPANY, INC.
A Radio Corporation of America Subsidiary Camden, N.J.
angles of view up to 70°, which is the limit of the charts. (There actually is a slight deviation from these values at the larger angles, but these were not considered, for sake of simplification.)
Curve 2 shows the brightness values for a white matte screen. You will note that this surface has lower reflectivity than the “standard” and a slight fall-off at 60°
FIGURE 5 — Comparison between average characteristics of different types of screen surfaces. Curves refer to ( I ) unperforated magnesium oxide, (2) perforated white coated screen, (3) "low gain" aluminized plastic screen, (4) "high gain" aluminized plastic screen, (5) aluminized lenticular screen.
Let s Play BALL!
Toss your worries to the wind and come and play ball with me. Wet, dry, hot or cold — whatever the weather — I'm always ready to perform beautifully.
You'll also find I'm very easy on your pocketbook. Besides costing very little to start with, my upkeep is practically nil.
I’ve been told I'm the prettiest, but I’m especially proud of my voice. But don't take my word for it! Ask the man who owns some EPRAD in-the-car speakers. See your favorite independent supply dealer.
The Speaker with the
"BIG" SOUND
“ The Voice of the Drive-In”
1207 CHERRY STREET • TOLEDO 4, OHIO
ELECTRICAL PRODUCTS RESEARCH
DEVELOPMENT COMPANY
and 70°. However, this curve is very similar to the “standard,” except for its lower efficiency due to perforations and surface material.
Curve 3, which represents the average brightness values for low gain aluminum screens, shows that at an observation angle of zero degrees (head-on) the brightness has been increased over the “standard” to 180%. This is the principal reason why this screen would be classified as having a gain of 1.8 over the standard.
However, let us look at what happens to this gain as the viewing goes from headon over to the side of the center line. At 10° the gain becomes about 1.5; at 20° the gain becomes 1.2; at 302 the gain is less than the “standard,” or .80; and at 50° the gain has dropped to .25, or 25% of the “standard.”
This is the principal reason why the simple statement of screen gain is valueless unless it is accompanied by a plot of the actual gain and distribution brightness characteristics for all angles of view.
Curve 4 shows the average plotted values for a high gain aluminum screen. The head-on gain is equal to 330% of the white “standard,” but at 20 3 viewing angle the gain is 200%, and at 30 3 the gain has dropped to .8, or 80% of the white “standard.”
Curve 5 shows the brightness values for a metallic-surfaced lenticular screen. T he center, or head-on, gain for this screen is
24
MOTION PICTURE HERALD, MAY 12, 1956