Geometrical instruments – Straightedge type – Plural straightedges – relatively moveable
Patent
1989-02-28
1990-07-17
Shoap, Allan N.
Geometrical instruments
Straightedge type
Plural straightedges, relatively moveable
33431, 33 15D, G01C 2120, B43L 706
Patent
active
049412647
ABSTRACT:
A device is provided for directly reading from a chart the heading to be followed by an air or sea-going vehicle, comprising a disk with, at its periphery, a circular coaxial graduation of the "compass card" type movable in rotation with respect to this disk, the latter being itself mounted for rotation about a fixed shaft fast with a support, via a rotary mount with offset adjustable in modulus and orientation. The disk further comprises a rectilinear scale for determining the modulus of the offset, as well as a reference mark for indicating the orientation of this offset on the circular graduation. The scale is graduated in successive values representative of the wind (or current) speed/proper speed of the vehicle ratio.
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patent: 4283861 (1981-08-01), Timmis
patent: 4499665 (1985-02-01), Davis
patent: 4512087 (1985-04-01), Jerhammar
Drucker William A.
Fulton Christopher W.
Shoap Allan N.
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