The Pechan will invert or revert (flip) the image, depending on the orientation of the prism, but not both at the same time.

The Schmidt-Pechan is based on the Pechan prism design: Both are a composite of two prisms, separated by an air gap.

"This is going to kill recruitment," said Sean Pechan, a 22-year-old advertising major, who said he doubted that students would be willing to dress in togas or grass skirts while sober.

Burton and later Sanjour along with Edward H. Pechan continued improving and advancing these computer models at the newly created U.S. Environmental Protection Agency.

The historically active Cone of Pechan is within the group (also known as Peishan, Baishan, Hochan, Aghie, Bichbalick, Khala, and Boschan).

The book, Aspects of Nature in Different Lands and Different Climates, Volume 1, reports that Pechan cone sent out streams of lava in the seventh century.

"There's a little hypocrisy here," said Mr. Pechan, the advertising major, who has heard stories from a generation or more ago, when fraternity house parties rolled through the nights, with keg after keg of beer, and marijuana smoke wafted down dormitory hallways.

For the Schmidt-Pechan design, the upper prism from the Pechan design is replaced with a Schmidt roof prism, so the Schmidt-Pechan prism can both invert and revert the image and so act as an image rotator.