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FIIG:  T271-A

Entry Date:  Apr-01-1974

Concept:  1

Status:  A

Applicability:  AA

Type:  0

Definition:  A telescope whose line of vision is bent 90 degrees.

Basic INC:  70261

Basic Name:  TELESCOPE

Description:  1. A single barreled optical instrument used as an assistance to the eye or camera in viewing or photographing distant objects. The chief purposes of the item are the enlargement of the visual angle under which a distant object is seen, and a consequent magnifying of the object and/or collection and concentration of a larger beam of light rendering objects visible or more distinct. The essential parts of a telescope are the objective lens or mirror which collect the beam of light and form the image, and the eyepiece of which the image is magnified. The barrel may be straight or may be designed so as to permit the use of reflective devices such as prisms in its optical system, or to provide viewing from the eyepiece through the barrel at an angle for specific observation purposes, and/or to provide means for a panoramic objective lens.