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| Keywords: Group of Deck Prisms.jpg en Group of original deck prisms from my personal collection own Ian macky 2010-06-04 Bottom view; tops are uniformly flat For scale the unusually large central reamer style prism recovered from the bottom of the Baltic is 7 3/4 in diameter; the yellow color is due to selenium added as a decolorizer which ironically solarized to that color due to prolonged UV exposure The three small hexagonal pyramid style prisms at bottom left are 3 across the flats smaller than the common Charles W Morgan reproduction and the two round glasses at bottom right are Lanergan's patent with external threads on the glass designed to be easily replaced Ship parts | ||||
