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Porro Abbey Prisms
Porro Abbes are small glass prisms used extensively by Uncle Sam as image-erecting systems in small optical instruments of the World War II era. They look like two small right angle prisms cemented together, but are actually made from one piece of glass. Ours have entrance faces about 5/16" square, giving them an overall length of 11/16". In final use, porro abbes would have received two facefuls of silver or aluminum to enhance reflectivity from key surfaces, but ours are plain. . . and they do have small edge chips which your fussy Uncle found offensive, and which you will barely notice in your rapture over porro abbes. Enough history. The pure bubble-free optical glass renders these prisms optical jewels suitable for window sills, earrings, and general spectral fascination. No passport needed.
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2611 PORRO ABBEY PRISMS |
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