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Fig. 1. Principle of projection. The projection lens of diameter D is at a distance from S of about / = focal length (for lateral magnifications of m = \/~A'IA > 1).
less, but it seemed clear that the success could only be reached at a much greater expense of research and development than was originally thought. But Prof. Fischer did not allow himself to be troubled and courageously started to design a second prototype. Already the outward appearance of the second projector made it clear that his bold original plans had been revised. Still the equipment was very large and complicated and there could hardly be any serious hope of its practical adoption in that shape. But the first target that had to be reached was the proof that the system could work at all. When Prof. Fischer's untimely death in the year 1947 brought his tireless activity to an end, the second projector was not yet in operation and the main problems were by no means solved. We do not lessen Prof. Fischer's lasting merits as a pioneer, if we say that only the development made after his death gave the system a basis for its practical adoption. The success is in the first place due to the optimism and untiring energy of his former collaborators, Dr. H Thiemann, F. Mast, K. Hetzel, Dr. F. Held and Dr. R. Petermann.
On the occasion of the International Television Convention in the summer of 1 948, the operation of the second prototype could be demonstrated. The quality of the pictures which was reached
then gave proof of considerable progress, and helped to strengthen very widely the hope of final success. Those responsible were convinced that the new experiences and discoveries would furnish the essential data for a third prototype which, considerably simpler and smaller than the second, should come much nearer to a solution that could be practically adopted. This third prototype which was first operated in December, 1 950, fulfilled our hopes in every essential point.
Since in this stage the stress lay on the problems of practical adaptation, it was time to secure the help of a competent industrial producer and to leave to him the responsibility for this difficult task. This was done in the spring of this year and the rights for the utilization of our system now lie with the firm Dr. E. Gretener A.G., in Zurich. As a university department we have retained the possibility to further the development in close collaboration with the firm.
2. Theoretical Requirements of the System
It will be known that the Eidophor system makes use of a light source for the production of the screen picture. The brightness, therefore, as in cinema projection, depends largely on the power of this light source. This fact and the relatively great efficiency of the system
E. Baumann: Fischer System — A Reprint
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