a. In photographic mapping, a device for measuring accurately the two rectangular coordinates of the image of a point on a photograph. Seelye, 2
b. An apparatus facilitating comparison of test material with known standard, or with other substances. A comparator miscroscope has a duplicate optical system, so that the observer sees two fields simultaneously (one with each eye). The Lovibond comparator has colored disks that can be matched against colored liquids to give approximate pH value, etc., using the same principle as with a set of pH color tubes in a more permanent and compact style. Pryor, 3
Source:
Dictionary of Mining, Mineral, and Related Terms












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