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452 TUTTLE November
Those who chose to rely on the image dissection system made no attempt to achieve definition in the direction of film travel except by the use of multiple-picture elements. There is no pretense of moving the image with the film, nor is streaking avoided by chopping the light. By restriction of the height of individual elements, it is possible to stop the smear every time it becomes too bad.
All of us have found picture unsteadiness a problem. Imperfect picture definition and imperfect picture registration have, therefore, always made the collection of motion data for first-, second-, and thirdderivative analysis difficult.
The device described here is not in any sense a cure-all for these troubles. It is our hope, however, that in some form it might prove itself to be useful.
A chronological history of the development work to date will aid this discussion.
Several years ago Richard Engelken, a well-known consulting engineer of New York City, undertook a display-device assignment. He conducted several experiments that led him to some interesting conclusions. Unfortunately, he died before he completed his studies, and only recently have we been able to try out some of his suggestions.
Very abbreviated and somewhat rephrased, his comments were as follows :
1. With a fine-grain emulsion we are satisfied with definition in a picture enlarged as much as thirty diameters (a microfilm standard) .
2. Let us put that same fine-grain emulsion on a plate thirty diameters larger than the frame size which we say gives us a satisfactory picture.
3. On this plate, then, without trying to get something for nothing, we should be entitled to store information sufficient in quantity to show thirty times thirty or nine hundred pictures, each with definition no better or no worse than that of single smaller pictures.
4. Now let us not make our nine hundred pictures all condensed small images which have to be enlarged for viewing, but let us space out the silver grains which are used to display a single picture in some orderly extended array so that each picture will be spread over the thirty-diameter plate.
5. This spacing of dots will be exceedingly coarse for the fine-grain emulsion used, so coarse in fact that in the neighborhood of each picture element there will be room for dots to be used for the eighthundred and ninety-nine other pictures.