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94 The Audio-Visual Handbook
ing one positive copy for projection is $1. This includes about thirty cents for developing, and about two cents per picture for printing. The appearance of semi-automatic selective printers in the market at popular prices will solve the printing problem for most amateur miniature camera and filmslide enthusiasts, especially if they have access to the facilities of a school laboratory or camera club darkroom.
The most recent and delightful development in the production of filmslides is the natural-color film for the miniature camera. Unfortunately for those who would like more than one positive copy, this is a "processed" film; the beautiful, colored projection positive is made by "reversing" the negative itself. Where a number of similar or identical negatives can be made at the same time, the camera owner eventually has that many similar positives for use. The manufacturers of color film for use in miniature cameras now produce duplicate prints for projection or make enlargements in full color. The service charges now seem high, but there is every indication of much lower prices as these films are used more extensively. The price of the negative — $2.50 for an eighteen-exposure roll — includes the processing, so the cost per picture, ready for projection, is about fourteen cents. This is far cheaper than hand-colored glass slides; cheaper, in fact, than the majority of black and white glass slides of standard size. (See list of manufacturers, pp. 217-222. j
Projection of Filmslides. Filmslides are usually shown in special projectors designed for the use of filmslides only. The filmslide projectors range in price from $15 to $57.50, including carrying case. It is usually desirable to purchase the best equipment the budget will permit. With these it is possible to keep one picture on the screen for any reasonable length of time without damage to the filmslide.
There are special attachments to the standard models of glass-slide projectors, for the protection of filmslides. They are almost as expensive as the separate filmslide projectors, and are not as efficient in protecting the film from heat. It is recommended that the school secure separate projectors for filmslides, so the glass-slide projector may be used at the same time — in a different room if desired — and so the more expensive 500watt lamp of the glass-slide projector will not be used unnecessarily.
The filmslide projectors generally in use in school are the ones which accommodate only the single-frame slides. With the increase in local and individual use of miniature cameras, and the gradual growth of stock libraries of double-frame filmslides, it will be desirable in many places to secure projectors which accommodate both sizes. Some of