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April, 1930] DIMENSIONAL ANALYSIS 383
Most of the important cases to be met in designing miniature sets have now been covered in a general way. It must be remembered, however, that the specific problems present themselves in an infinite number of combinations, and each one must be solved in a slightly different way. Fortunately we do not usually have to have everything perfect, but need concentrate only on those phases of the structure which lend themselves to enhancing the illusion or spoiling it, as the case may be. There is no set of equations by the use of which any one may design convincing models, but one who has a sound foundation in physics and mathematics combined with a clear understanding of dimensional relations may use this knowledge to see at a glance the important considerations of the problem, and apply his ingenuity to a solution that will give an excellent impression on the screen.
The difficult conception for the layman to grasp is the idea of a connection between time magnification and linear magnification, for he is thinking in terms of optics, and knows that the actual optical process is geometrically the same in taking pictures at high speed as when taking them at normal speed. To fully grasp the idea it must be remembered that the linear magnification which we are discussing is not an optical one but a psychological one, and is just as true to physical law in the case of a perfect mind as the optical magnification which might be accomplished with lenses. The untrained mind is easier to satisfy than the trained mind, but the trained mind, for the same reason, is more appreciative of an illusion sufficiently good to be outside his power of detection. It is pleasing to know that it is within our power, by using simple physical laws, to produce illusions which cannot be detected by the hypothetically perfect mind.