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tain rules and requirements (first-aid equipment, dangerous bathing, etc.).
The Cinema Service sees the films through all their stages > from taking the photographs to supplying the positives.
A scenario composed by an instruction officer is handed over to the Service.
This scenario consists of a written description in extenso of the theory the film has to illustrate.
Experience has shown, however, that there are many formidable obstacles to a satisfactory elaboration of the scenario. The principal difficulty is due to the fact that the author, being himself an expert on his subject, often fails to realize that his future audiences will not possess his knowledge or his mental capacity, and will not always be able to understand his explanations with the same facility he would himself.
There is a tendency to imagine that recruits are acquainted with ideas that are in fact quite new to them ; these ideas seem to be of elementary simplicity to the teacher, who is familiar with them,, while their novelty renders them obscure to the raw recruit.
This represents a danger not only for recruits, but also for the film producer. It is his job, when first studying the scenario, to discern such defects and to remedy them.
Let us suppose for the moment that the scenario writer is an excellent teacher, who thoroughly appreciates the quality of his audience, but who deems it tedious and fussy to reproduce in a film the multitude of explanations which he is wont to give verbally when conducting his courses.
He forgets that the screen rapidly replaces one image by another, while in his class he would keep beside him the objects which would help to elucidate his remarks.
For this reason he neglects to interrupt the unrolling of the pictures on the screen, either so as to immobilize a given image (i)
(i) Do not let us fall into the very error of which we are accusing the scenario novice, and forget to state that the instructional film must be projected by means of an apparatus which allows pictures to be immobilized on the screen and the show to be assisted by slides.
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