File:Group of Deck Prisms.jpg

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English: Group of original deck prisms from my personal collection.
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Source Own work
Author Ian.macky

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.

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Public domain I, the copyright holder of this work, release this work into the public domain. This applies worldwide.
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current15:27, 4 June 2010Thumbnail for version as of 15:27, 4 June 20101,280 × 896 (171 KB)Ian.macky~commonswiki (talk | contribs){{Information |Description={{en|1=Group of original deck prisms from my personal collection.}} |Source={{own}} |Author=Ian.macky |Date=2010-06-04 |Permission= |other_versions= }} Bottom view; tops are uniformly flat. For scale, the unu

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