公开(公告)号：US3591297A

公开(公告)日：1971-07-06

申请号：US3591297D

申请日：1968-11-06

Applicant: HAGNER BO ANDERS V

Inventor： HAGNER BO ANDERS VILHELM

IPC: G01J1/04 ,  G01J1/42

CPC classification number: G01J1/04 ,  G01J1/0233 ,  G01J1/0247 ,  G01J1/0271 ,  G01J1/0411 ,  G01J1/0437

Abstract: A photometric instrument having two photoelectric cells coupled to a common moving coil meter, one of said cells being arranged within a casing to measure, in conjunction with an optical viewing system, a small viewing angle, and the other of said cells being adapted to be used externally of said casing to measure illumination and eventual luminance within a large viewing angle. The pointer of said coil meter is common to two reading scales one of which can be viewed through the optical view system and the other of which can be viewed from a position external of said casing.