A periscope was developed by the Savannah River Laboratory and is currently being used for the visual examination of irradiated reactor fuel in a water-filled basin. Of the several advantages which this instrument has over those periscopes commercially available, the most notable are its low cost and its ease of maintenance because of the above-water placement of all precision optical components. Its optical quality has proven satisfactory for both visual and photographic work.nThe periscope, shown in Figure 1, consists of a vertical view tube welded perpendicularly to a short horizontal tube, on the front of which is a sealed glass window. A first-surface mirror, placed at the intersection of the two tubes, reflects light from the window to a telescope and camera mounted at the upper end of the vertical tube.
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