Abstract: Apparatus for enabling an electrophotographic reproduction device to make reproductions of slide transparencies. The electrophotographic reproduction device includes a transparent platen for supporting information to be reproduced. A main lens assembly projects a focused image of information on the transparent platen onto a photoconductive member to form a latent image charge pattern of such information. The apparatus for enabling the electrophotographic reproduction device to make reproductions of slide transparencies comprises a mechanism for projecting a real image of a slide transparency along an optical path onto the transparent platen. A Fresnel lens, serving as a field lens for the main lens assembly, is located in the optical path of the projecting mechanism, between the projecting mechanism and the transparent platen, and space from the transparent platen so as to be beyond the depth of focus of the main lens assembly.

Abstract: In a fluid flow supply system, monitoring a fluid supply system to accurately determine whether an abnormal flow condition or a catastrophic flow condition exists in such supply system. A parameter of fluid flow in the supply system is measured and a first signal is produced corresponding to such parameter. A first timer, adapted to be reset by the first signal, produces a signal upon expiration of a preselected time period. A second timer, adapted to be reset by the signal produced by the first timer, produces an output signal upon expiration of a preselected time period substantially greater in duration than the preselected time period of the first timer. Accordingly if the time period of the first timer is not exceeded (i.e., it is continuously reset by first signals measuring the fluid flow parameter), then the time period for the second timer will be exceeded whereby an abnormal flow condition is determined to exist.