The convergence to different foci, by a lens or mirror, of rays of light emanating from one and the same point, or the deviation of su…
Its definition shares important concepts with this word: telescope, diagonal, eyepiece, suspended, vertically.
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Optigraph
A telescope with a diagonal eyepiece, suspended vertically in gimbals by the object end beneath a fixed diagonal plane mirror. It is used for delineating landscapes, by means of a pencil at the eye end which leaves the delineation on paper.
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