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1 August 1967Active Optical Systems For Orbiting Astronomical Observatories
It has been recognized that a large orbiting astronomical telescope should be a major objective of the National Space Program, now that sufficiently large rocket booster capability is being developed. 1 A telescope aperture of at least 120 inches is a reasonable goal within the next decade. Technologically, one of the most formidable problems in such an undertaking is that of fabricating and maintaining the figure of the primary mirror of such a telescope to the required tolerance.
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H. J. Robertson, "Active Optical Systems For Orbiting Astronomical Observatories," Proc. SPIE 0008, Airborne Photo-Optical Instrumentation, (1 August 1967); https://doi.org/10.1117/12.970990