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BRITISH KINEMATOGRAPHY
Vol. 23, No. 3
Fig. 2.
Cross-section of ramp.
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tilt the car so that the screen can be viewed by the occupants while sitting in the same position as when normally driving along a road. Since the centre line of the screen is from 35 feet to 65 feet above ground level, it is necessary to slant the entire car towards the centre of the screen. Each arc of ramps is progressively further from the screen, so the angle of tilt on each ramp will become less as the distance from the screen increases. It is also necessary to provide an unrestricted view for each successive row of cars; the top of the car in front must therefore not obstruct the view of the car behind it. Probably the ideal grading system and land location is one where the screen is set on a slightly higher spot than the last arc of ramps and the ground slopes gently from the screen tower to the last ramp. This also simplifies the question of drainage, for if the drainage is inadequate and the ramp surfacing poor, a rainy evening and several hundred cars can make a quagmire of a drive-in, causing costly regrading of the ramps. If the natural slope of the land will not provide surface drainage an underground system of ducts is necessary. The surface of the ramps and connecting driveways must be durable and some luxurious theatres have asphalt surfaces, although the majority use a mixture of crushed rock, coarse gravel and sand, coated with heavy road oil and rolled. The oiling and rolling is repeated at intervals, depending on wear and tear and climate.
Fig, 3. Motiograph in-car speaker and junction box
showing volume control knob on speaker and neoprene
covered cradles.
See text for ramp grading information.
The ramps are usually about 40 feet apart, thus allowing cars to enter and leave easily. The first ramps should be at least 100 feet from the screen, although a distance of from 130 to 150 feet is preferable. Of the 40 feet allowed between ramps, about 18 feet is slanted for parking the car. A width of about