Manograph definition

Manograph





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From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Manograph \Man"o*graph\, n. [Gr. ? thin, rare + -graph: cf. F.
     manographe.] (Engin.)
     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 operated by an
     elastic metal diaphragm which closes a tube connected with
     the engine cylinder. It is also moved at right angles to this
     direction by a reducing motion, called a reproducer, so as to
     copy accurately on a smaller scale the motion of the engine
     piston. The resultant of these two movements imparts to the
     reflected beam of light a motion similar to that of the
     pencil of the ordinary indicator, and this can be traced on
     the sheet of ground glass, or photographed.
     [Webster 1913 Suppl.]

















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