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an optical system for projecting onto a screen images of opaque objects, such as hardware, technical drawings, illustrations, and photographs.

The basic optical diagram of an episcope is shown in Figure 2 in PROJECTOR. In an episcope, the object whose image is being projected reflects diffusely the light rays striking it; thus, only a small amount of the reflected light enters the projection lens. The brightness of the image is enhanced by using one or more powerful light sources as well as high-transmission projection lenses with relative apertures of up to 1:1.5–1:2. Since the focal lengths of episcope lenses are usually shorter than those of diascope lenses, the magnification produced by an episcope is lower. A mirror located above or behind the projection lens of an episcope inverts the image so that it is right side up when it appears on the screen (see: Figure 1). A special cooling system is required in an episcope because of the intense heat that is generated.

An episcope may be a component of the optical system of the alterable projectors known as epidiascopes, which can project images of both opaque and transparent objects onto a screen.

References in periodicals archive ?
The same partially stands for episcopes and bishops in Herzegovina.
Also, episcopes and bishops met on regular basis in the period from 1998 to 2000 (Tuzla, Banja Luka and Sarajevo), promoting reconciliation, return of displaced persons, the need to establish the rule of law and the practical realization of the concept of "unity in diversity" as a primary objective of inter-church dialogue in Bosnia and Herzegovina.
55) Such, for the SOC, largely ignorant position of RCC's regarding the most important issues, has caused the resistance of some episcopes of the SOC and postponement of the scheduled session of the Joint Commission.
Between 300 and 50 metres the T40 is provided with episcopes for direct view and with a 360[degrees] situational awareness system made of three elements each containing three Low Light CCD cameras covering 40[degrees] each, thus providing full clay and night coverage.
A series of episcopes provides direct situational awareness to the gunner, on 2200, and to the commander, on 360[degrees].
The front cabin has a side-by-side seating arrangement for the driver and commander, both having two flat screens showing images from the front and rear thermal and daylight cameras while direct view is provided by seven episcopes.