[Skip to Content]
[Skip to Content Landing]
Article
September 1951

A COMBINATION SQUARE PRISM AND LOLLIPOP HOLDER

AMA Arch Ophthalmol. 1951;46(3):337-338. doi:10.1001/archopht.1951.01700020346010
Abstract

In a standard square plastic or glass prism, averaging about 38 mm. square, two small holes were drilled, each about 5 mm. in length and 2 mm. wide, one into the base and the other in one side of the prism. The hole in the base of the prism was drilled perpendicularly at a point midway of this rectangular surface. The hole in the side of the prism was drilled perpendicularly at a point midway between the apex and the basal edge. The holes were then tapped to permit the ready insertion of a rod about 6 inches (15 cm.) long, with one end threaded to screw readily into either of these spiraled openings. The result was a simple prism holder which could be changed readily to a base-down, base-in or base-out position. In a more recent model the holes were not threaded. One end of the rod holder was

First Page Preview View Large
First page PDF preview
First page PDF preview
×