Navigational instrument

Details Navigational instrument Navigational instrument

1986-05-22

1988-01-26

Little, Willis

Geometrical instruments

Straightedge type

Plural straightedges, relatively moveable

33149R, 33152B, 33149H, 33 1C, G01B 316, G01B 2120

Patent

active

047209216

ABSTRACT:
A navigational instrument for measuring bearings and distances on maps comprising a first leg and a second leg. Each leg is transparent in part for convenient use while reading a map. Each leg, additionally, is tapered toward a lower end, defining a tip at each lower end. The first leg has an opening defining a channel for receiving a writing instrument which selectively can be positioned with the tip extending through the opening for writing or with the end opposite the tip protruding through the opening for storing the writing instrument. The first and second legs are pivotally coupled in the vicinity of the legs' upper ends and have a plurality of scales disposed about the pivotal coupling. One scale is used for measuring bearing. A second scale is used for measuring nautical miles on a Sectional Chart. A third scale is used for measuring nautical miles on a WAC chart.

REFERENCES:
patent: 376379 (1888-01-01), Hanower
patent: 380360 (1888-04-01), Spencer et al.
patent: 3365802 (1968-01-01), Woods
patent: 3816928 (1974-06-01), Fessenden
patent: 3863347 (1975-02-01), Banner
patent: 4388759 (1983-06-01), Orejola

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