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stereo-comparator
stereo-comparator n. 
/ˌstɪərɪəʊkəmˈparətə/, /ˌstɪrioʊkəmˈpɛrədər/ [comparator n.] an instrument enabling two different photographs of the same region to be seen simultaneously, one by each eye, either to detect any change (in the case of photographs of the night sky taken at different times) or to make measurements of the area depicted in stereoscopic photographs.
Brit. /ˌstɛrɪəʊkəmˈparətə/
, /ˌstɛrɪəʊkəmˈparətə//ˌstɪərɪəʊkəmˈparətə/U.S. /ˌstɛrioʊkəmˈpɛrədər/
, /ˌstɛrioʊkəmˈpɛrədər//ˌstɪrioʊkəmˈpɛrədər/ΘΚΠ
the world > physical sensation > sight and vision > optical instruments > instruments for observing > [noun] > comparator
optical comparator1901
stereo-comparator1901
blink microscope1911
blink comparator1930
1901 Observatory Dec. 471 A new instrument called a ‘Stereocomparator’,..described by Dr. Max Wolf in Astr. Nach. No. 3749.
1903 Daily Chron. 1 Dec. 7/7 The object of the stereo-comparator is..to detect at a glance any unusual objects, such as new stars, variable stars, or small planets.
1908Stereocomparator [see stereoplotter n.]. 1939 Geogr. Jrnl. 93 240 An improved stereocomparator for air triangulation.
1950 Jrnl. Royal Aeronaut. Soc. 54 619/2 In cases where co-ordinate measurements are made in a precise stereocomparator, the prints are made on a non-distorting surface such as sensitised aluminium foil.
1975 J. B. Harley Ordnance Survey Maps i. 11 By means of self-recording stereocomparators precise pairs of measurements of co-ordinates are made on pairs of overlapping aerial photographs.
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