Photometric instrument

Claim 1

A photometric instrument comprising, in combination, a casing; an optical viewing system arranged within said casing for viewing an external scene; a first photoelectric cell for sensing illumination of said external scene within a small viewing angle coupled to said optical system; a second phOtoelectric cell remotely positionable by lead means outside of said casing for sensing illumination of a scene within a large viewing angle independently of said viewing system; a meter within said casing and having a pointer, said meter being selectively coupled alternatively by switch means to said first photoelectric cell and said lead means for alternatively receiving signals from said first photoelectric cell and said second photoelectric cell; an opaque scale plate formed with an arcuate transparent portion operatively associated with said meter, said scale plate having a first reading scale arranged on said transparent portion for registering signals from said first photoelectric cell and a second reading scale viewable externally of said casing arranged on an opaque portion of said scale plate for registering signals from said second photoelectric cell, said pointer being common to both of said reading scales; and means including an angled mirror within said casing and offset from said optical viewing system for viewing said first reading scale internally via an eyepiece associated with said viewing system.