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
      Photography

Distribution Statement : APPROVED FOR PUBLIC RELEASE