Abstract: A pulse jet liquid gas cleaning system has an ultrasonic transducer operable to transform a high-pressure stream of cryogenic fluid from a cryogenic fluid supply into pulsed jets of individual cryogenic fluid slugs.

Abstract: A pulse jet liquid gas cleaning system has an ultrasonic transducer operable to transform a high-pressure stream of cryogenic fluid from a cryogenic fluid supply into pulsed jets of individual cryogenic fluid slugs.

Abstract: A photoplotting apparatus is provided. The apparatus comprises an internal drum plotter and a media sheet handling apparatus for sequentially delivering a photosensitive media sheet to the photoplotter for exposure from a stack of such sheets. The photoplotter has reduced turbulence within the drum during exposure of the media sheet, and the sheet handling apparatus includes means for separating the sheets in the stack from interleaves disposed between adjacent sheets in the stack.

Abstract: An apparatus for printing, cutting or otherwise working sheets of sheet material has a friction sheet advance mechanism and a sheet loading mechanism in advance of the feed mechanism having rows of sprocket pins cooperating with complementary rows of sprocket holes in a sheet to assure accurate insertion of a sheet into the sheet advance mechanism and subsequent accurate movement of the sheet through the advance mechanism and past a work station. A photosensor carried by the work head of the apparatus senses one side edge of the sheet as a reference for laterally positioning the work process relative to the sheet, and a transversely extending index edge of an index hole in the proof sheet is detected and used as a reference for the longitudinal positioning of the work process relative to the sheet.