One of the four regions into which the abdomen may be divided for purposes of physical diagnosis.

See <<international henry>>

1. An instrument for measuring altitudes, used, for example, in astronomy, surveying, and gunnery; employs a sight that can be moved through a graduated 90° arc.

2. A lever that can move through a 90° arc.

1. A quarter of a circle; either an arc of 90° or the area bounded by such an arc and the two radii.

2. Any of the four regions into which the plane is divided by a pair of coordinate axes.

A device for converting horizontal reciprocating motion to vertical reciprocating motion.

A casting, forging, or built-up frame in the shape of a sector of a circle attached to the rudder stock and through which the steering gear leads turn the rudder.

One of the four areas between consecutive equisignal zones of a four course radio range station.

A double-reflecting instrument for measuring angles, used primarily for measuring altitudes of celestial bodies; the instrument was replaced by the sextant.

A sector of one-fourth of the field of vision of one or both eyes.