Specifications for experimental grade optics may vary as much as 10% from those listed. Also, no additional information is available other than what is provided.
A Porro-Abbe prism is sometimes called a double right angle prism. Two of them are used to make an erecting system for telescopes and some models of binoculars. One of these prisms can be used to bend an image 90° and rotate a vertical image horizontally.
A 45°-90° -45° reflecting prism whose surfaces form the 90° angle reflecting the light beam through a total angle of 180°.
During W.W.II US Army tanks carried panoramic periscopes so they could maneuver secured, without exposing the driver in battle. The glass prism head for these periscopes was a favorite target for enemy snipers, thus each tank had many spares. Packed in its original issue carton, each prism is housed in an army green metal frame which snapped into the periscope. A great collector’s item!
Very close to being an equilateral prism, this prism has slightly different angles, two being 65° and the final being 50°. This prism was a custom project now no longer used.
This cube is of high quality optical glass, with four polished sides. It can be used in teaching the refraction of light and controlled rotation for experiments in interrupted light beams.
A normal right angle prism with a groove cut across one of the sides, presumably as part of some mounting system.