Abstract
In the previous session of this conference interesting and significant advances in techniques of astronomical data acquisition with television, diode array, and electronographic techniques with the possibility of data storage from these sensors directly on computer compatible magnetic tape, core, or disk storage have been presented. This paper is about a measurement system for data that has been stored only on photographic film — the measurement of stellar proper motions. More than eight years of experience in digitizing the data stored on photographic plates has developed in our group at Control Data Corporation a deep and abiding respect for the vast amount of information—wanted and unwanted, good and bad—that is stored on each photographic star plate! The photographic plate, with all of its non-linearity of response, granularity, and noise, is still an outstandingly compact, practical data storage device.
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