Primitive plane

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(Spherical Projection) the plane upon which the projections are made, generally coinciding with some principal circle of the sphere, as the equator or a meridian.

See also: Primitive

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
It did - and still does - seem like the stuff of science fiction, coming little more than 65 years after the first manned airborne flight by the Wright brothers which lasted a bumpy 12 seconds and saw the primitive plane travel just 120 feet.
DEADLY Dogfights in primitive planes were just one of the perils facing WWI fliers
THINK of war in the air a century ago and there they are, Biggles in his Sopwith Camel, the Red Baron leading his famed Flying Circus, primitive planes piloted by chivalrous young paladins duelling above the clouds, knights of the sky idealised in films like Dawn Patrol and Hell's Angels.