American Dictionary of the English Language

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1. Correctly spelled; written with the proper letters.

2. Pertaining to the spelling of words; as, to make an orthographical mistake.

Orthographic projection of the sphere, a delineation of the sphere upon a plane that cuts it in the middle, the eye being supposed to be placed at an infinite distance from it.

A projection in which the eye is supposed to be at an infinite distance; so called because the perpendiculars from any point of the sphere will all fall in the common intersection of the sphere with the plane of the projection.