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Convex on one side, and flat on the other; plano-convex.

A plane on a door, giving the name, and sometimes the employment, of the occupant.

An aëroplane with a boatlike or other understructure that enables it to travel on, or to rise from the surface of, a body of water by its own motive power.

A hydro-aëroplane having two supporting planes.

A plane, or any of a number of planes, projecting from the hull of a submarine boat, which by being elevated or depressed cause the boat, when going ahead, to sink or rise, after the manner of an aëroplane.

Between planets; as, interplanetary spaces. Boyle.

Having several or many planes or plane surfaces; as, a multiplane kite.

Not lying in one plane; -- said of certain curves.

One unprovided with motive power.

An aëroplane with four superposed main supporting surfaces.

See Scaleboard plane, under Scaleboard.

To glide in a flying machine.

xis; amounting when greatest, in the former case, to 20.4'', and in the latter, to 0.3''. Planetary aberration is that due to the motion of light and the motion of the planet relative to the earth.

eom.), that curvature of a curve of double curvature, which is measured in the osculating plane of the curve. -- Absolute equation (Astron.), the sum of the optic and eccentric equations. -- Absolute space (Physics), space considered without relation to material limits or objects. -- Absolute terms. (Alg.), such as…

ifty-six seconds of solar time earlier than on the day preceding. -- Acceleration of the planets, the increasing velocity of their motion, in proceeding from the apogee to the perigee of their orbits.

ch a right line, drawn from the eye, parallel to a given right line, cuts the perspective plane; so called to distinguish it from the principal point, or point of view, where a line drawn from the eye perpendicular to the perspective plane meets this plane. -- Accidental lights (Paint.), secondary lights; effects of l…

A form of hydro-aëroplane; a flying boat.

An aëroplane or airship designed to carry passengers.

A modification of the aëroplane, having curved surfaces, the advantages of which were first demonstrated by Lilienthal.

A plane or arched surface for sustaining bodies by its movement through the air; a spread wing, as of a bird.