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From The Collaborative International Dictionary of English v.0.48:
Orograph \Or"o*graph\, n. [Gr. 'o`ros mountain + -graph.] (Surveying) A machine for use in making topographical maps. It is operated by being pushed across country, and not only records distances, like the perambulator, but also elevations. [Webster 1913 Suppl.] Orographic