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September, 1953
FLAHERTY : DRIVE-IN THEATRES
67
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W • A • V
/-/£. 1 . Layout of typical drive-in theatre.
cent of the income of a drive-in is from the concession stand, it is easy to see the importance of the concession building. The concession dispenses candy, pop (ginger beer), pop-corn, hot dogs, ice cream, etc., and this results in a small projection room and a large concession stand.
The drive-in is fundamentally a motionpicture theatre moved outdoors, the sound being distributed to each car. There is a volume control fitted on each car-speaker so that the patron can regulate the volume to suit himself. It may sound simple, but with 40-foot wide screens 150 feet away, and 100 to 500 watts audio power spread over 300 to 900 speakers the projectionist's task is not always easy.
Ramps
After a particular site has been approved for construction the next question, depending on the slope or on the " levelness " of the land, is the type of ramp to be used. One of the many types used has either the front or back wheels of the car in a shallow ditch, thus giving the desired slant towards the screen. This method has the advantage of a lower initial outlay, but its application is limited and there is the disadvantage of some difficulty in entering and leaving the ramp. The other, and most used type of ramp, may be compared with a series of concentric waves in the ground radiating from the screen. Fig. 2 shows a cross-section of one such wave. It will be seen that the purpose of the ramp is to