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March, 1926
Among the Producers
181
THEATRE EaUIPMENTNEW AND USED
Moving Picture Machines, Screens, Portable Projectors, Stereopticons, Spot Lights. Booths, Film Cabinets, M. P. Cameras, Slides, Carbons, Mazda. Lamps, Gelatine, Etc.
MOVIE SUPPLY CO. su so.wabash ave. CHICAGO lUS.
Brayco Film Stereopticons
$25.00
Write for Catalogue
while standard-width film is sometimes used, the narrower 16-mm. film is becoming increasingly popular, due to lesser cost. Of this type the booklet says,
"This film, after exposure, is developed and then re-developed to form a positive directly from the negative, eliminating the cost of the positive film and obtaining more pictures per foot. The cost of pictures taken on 16-mm. film is $1.50 per 1000 pictures, as compared with $10.00 on a larger film, while the weight of equipment using this small film is only one-third to one-fourth that of other equipments. Extensive libraries of pictures especially suitable for the home are being built up in the smaller size. The 16-mm. film is manufactured exclusively of non-inflammable stock, so that the fireproof booth is unnecessary."
In the business field, motion pictures are usually projected with portable machines — • either using standard or 16-mm. film. Lan
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Fig. 8 — Standard width (35 mm.) film compared with 16 mm. film ; each roll contains 8,000 pictures (6 minutes projection) .
tern slide projectors working automatically and projecting thirty or more slides in succession are coming into increasing use — particularly in theatre lobbies and show windows. To quote again:
"The attention-compelling power of the motion of one picture being replaced automatically by another is well recognized. Film projectors using an endless band of film and operating continuously are also available for this service."
A considerable portion of the 13 pages is devoted to an analysis of requirements which must be fulfilled by both projection equipments and screens, in order to obtain maximum utilization of light and good appearance of the projected picture on the screen. A full discussion of lamp adjustment and the optical system in projection follows. On the subject of screens the writer says:
"High quality projection requires the choice of a suitable screen which fits the shape of the auditorium in which it is being used. Where th^ ividl^ «f the auditorium is equal to or greater ^ISan its length, screens having a matte or diffusing surface are necessary in order that the extreme side seats receive sufficient screen illumination. When the length of the room is greater than its width, the
Fig. 9 — Motion picture projector using 16-mm. film, used in the home, schools and in business.
metallic surface screen materially increases
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