Accession Number : ADD000577
Title : Optical Comparator.
Descriptive Note : Patent,
Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON D C
Personal Author(s) : Shell,Forney L
Report Date : 25 Mar 1975
Pagination or Media Count : 7
Abstract : The patent discloses an apparatus for optically comparing an opaque object and a transparent object which are in geometric alignment. The apparatus includes: a source of light, emitting a beam of light; a fixedly positioned beam splitter, so disposed that the beam of light impinges upon it at 45 degrees; and a magnifying lens, disposed forward of the beam splitter and adjustable for focusing and viewing whose optical axis is at 45 degrees to the beam splitter.
Descriptors : *Optical instruments, *Patents, Comparison, Photographs, Alignment, Transparence, Opacity
Subject Categories : Test Facilities, Equipment and Methods
Distribution Statement : APPROVED FOR PUBLIC RELEASE