Modification to 8” Optical Mount for Navy Prototype ...

NPOI site, Flagstaff, AZ (Photo courtesy of Michael Collier). The original design layout of the NPOI does not require the periscope to be internally reconfigurable. Each of the four periscope mirrors are gently held in a tangent-arm gimbaled mount that achieves precision alignment, on the order of 200 milli-seconds of arc, through a range of ... ................
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