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466 TUTTLE November
thirty units of length along the periphery from the outermost on the previous one, there is an identical radial series of holes. However, on this radius each hole along the radius is one unit closer to the center than its contemporary on the radius just ahead of it. This process or spiraling-in of holes is continued for additional equispaced radii until the radius is reached on which the outermost hole is at a distance one unit of length from the center greater than the second hole on the initial radius considered. Since the separation between the outermost hole and the next one in on any radius is thirty units, this requires thirty radii, each with its series one unit closer to the center than its
TWO DIMENSIONAL SCANNING WITH MULTIPLE FOCAL PLANE APERTURES AND CAPPING SHUTTER
Fig. 1
predecessor. Since each radial series is separated from its neighbor by thirty units on the periphery, the linear distance involved is 900 units. At this point the configuration is repeated and continued until the complete disk is covered. Any hole of unit diameter travels 600 units before it uncovers emulsion which has already been exposed. In other words, based upon the frame slit-width function, 900 separate frames are available. At the moment we are using a disk in which the hole diameters are one-half thousandth of an inch and the separations involved are therefore fifteen thousandths. Such a configuration, when used to scan a 4 X 5 plate, produces a pattern for each frame 240 dots high and 300 wide. The manner of producing such a sieve will be the subject of a future paper.