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the auditorium characteristics and one suitable to the amount of light available to produce a satisfactory picture brightness.
RELATIVE
PERCENTAGE
IOO
SO
Screen Size
A survey carried out on a representative group of kinemas in this country and compared with a similar survey made in the U.S.A., revealed that picture areas here are roughly 40 per cent, larger than those in the U.S.A., which inevitably means that they are only about 60 per cent, as bright. It is to be hoped that the days are happily past when exhibitors insisted on larger and larger picture areas, with an utter disregard to the limitations of illuminating them, and then assumed a hurt expression when they found their large pictures to be dull and uninteresting, while their less expansively minded competitors had bright and sparkling picture presentation.
Reference may well be made here to Magnascopic picture presentation. This is acceptable as a medium for the impressive presentation of certain trailers or special short items, but the fact that the average Magnasscopic picture has a brightness factor only 50 percent, of normal speaks for itself.
Eyestrain Regulations
Before leaving Item 4, it is necessary to refer to the existing eyestrain regulations. In 1920 a Joint Committee of the I.E.S. and others investigated the matter at some length. Their subsequent findings were adopted by the leading Licensing Authorities and are well known to kinema architects. The suggestions contained in the report were designed to provide that persons
seated at the extremes of horizontal visual angle should not have to turn their heads more than 65 degrees from normal to take in the farthest vertical boundary of the picture, and similarly, that persons seated at the extremes of vertical vision angle should not have to elevate their heads more than 35 degrees from normal to take in the farthest horizontal boundary of the picture.
To sum up on the question of picture size and screen illumination, if exhibitors demand auditoria of such dimensions and seating capacities as to make necessary the provision of picture areas in excess of 420 square feet, or demand out-of-proportion picture sizes from the showmanship or publicity angles, then such pictures cannot be adequately illuminated at present nor until such time as technical progress results in the provision of equipments giving greater lumen outputs. Fig. 7 illustrates how a reasonable increase in picture width can result in a doubling of picture area.
8o
70
eo
so
AO
30
30
IO
12 14
16 16 20 22 24 26 26
PICTURE WIDTH IN FEET
30
Fig 4.
Relation of Screen Sizes in Great Britain and United States.