optigraph definition

  • noun:
    • A telescope with a diagonal eyepiece, suspended vertically in gimbals because of the item end beneath a hard and fast diagonal jet mirror. It really is useful for delineating surroundings through an attached pencil.
    • A telescope with a diagonal eyepiece, suspended vertically in gimbals by the item end beneath a fixed diagonal airplane mirror. It is employed for delineating landscapes, through a pencil at eye end which renders the delineation on paper.
    • a kind of telescope built for the intended purpose of copying surroundings, etc.
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