Geometrical instruments – Apparel – Laying out
Patent
1976-12-03
1978-10-17
Aegerter, Richard E.
Geometrical instruments
Apparel
Laying out
33 1SD, G01C 2120
Patent
active
041200918
ABSTRACT:
A single air navigation instrument provides sequential direct readings of true-course, magnetic-course, magnetic-heading, distance and flight times; determines in value and sense the altitude correction corresponding to actual barometric pressure at sea-level, and provides solutions of the wind triangle.
The longitudinal borders of the instrument carry a scalimeter having distance scales graduated in nautical miles. A first rotating goniometer inserted between the upper and lower faces of the instrument protrudes enough to permit its rotation by thumb or finger action. The center of the first goniometer is transparent and carries an arrow visible through windows on both sides of the instrument, permitting the positioning of the instrument directly on navigational charts. The reverse side of the disc carries the inner scale of a circular logarithmic slide-rule.
Chronometric nomographs graduated in minutes are positioned to be visible on the face of the instrument, with the distance graduations of the nomographs being aligned with corresponding distance graduations on the scalimeter scales.
On the reverse side of the instrument, the wind triangle may be solved by use of a polar grating underlying a square slider which has a rotatable transparent second goniometer, having a radial vector graduated in units of the wind's vectorial speed. Directional graduations are located on the slider for use in obtaining the wind impact angle.
REFERENCES:
patent: 2425097 (1947-08-01), Isom
patent: 3361346 (1968-01-01), Warner
patent: 3496640 (1970-02-01), Warner
patent: 3514582 (1970-05-01), Sanderson
patent: 3625417 (1971-12-01), Slauter
patent: 3735100 (1973-05-01), Wagenfeld
Aegerter Richard E.
Shepperd John W.
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