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Manograph

Manograph logo #21002• (n.) An optical device for making an indicator diagram for high-speed engines. It consists of a light-tight box or camera having at one end a small convex mirror which reflects a beam of light on to the ground glass or photographic plate at the other end. The mirror is pivoted so that it can be moved in one direction by a small plunger opera...
Found on http://thinkexist.com/dictionary/meaning/manograph/

Manograph

Manograph logo #20972Man'o·graph noun [ Greek ... thin, rare + -graph : confer French manographe .] (Engineering) An optical device for making an indicator diagram for high-speed engines. It consists of a light-tight box or camera having at one end a small convex mirror which reflects a beam of light on...
Found on http://www.encyclo.co.uk/webster/M/19
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