Abstract
A number of image-scanners using tilting plane-mirrors are described for use with optical-imaging systems. The paper compares these types and includes some novel designs particularly useful for infrared astronomy with great advantages over conventional systems. The tilting mirror-systems described either use two mirrors on a common tilting base, or for lower inertia use two mirrors independently pivoted but mechanically linked. Moving double mirror-systems may be replaced by equivalent single mirror arrangements with some considerable advantages. Two such double mirror-systems have been built and one of the equivalent single mirror systems is proposed as an optical path invariant, two-dimensional image-scanner.
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