Navigational angle-measurement device

Details Navigational angle-measurement device Navigational angle-measurement device

1982-11-09

1984-06-19

Stearns, Richard R.

Geometrical instruments

Miscellaneous

Light direction

33403, 33485, G01C 100, G01B 356

Patent

active

044546548

ABSTRACT:
A two-part navigational measurement device comprising a transparent circular disc having a coordinate grid thereon. An annular ring is coaxially positioned about the circular disc, the circular disc being rotatable within the annular ring. The annular ring has gradations around at least half of its circumference. A tangent ruler is fixed to the annular ring, the tangent ruler having a tangent edge which is tangent to the annular ring at the mid-point of the gradations. Means, such as a set screw may be provided for locking the disc and the annular ring against rotation relative to each other after the course to be adhered to has been determined.

REFERENCES:
patent: 1349455 (1920-08-01), Zeiner-Henriksen
patent: 2004951 (1935-06-01), Jensen
patent: 2190071 (1940-02-01), Keppers
patent: 2602228 (1952-07-01), Webber
Miller et al., "Tangent Protractor", RCA Pub. No. 559,280, Feb. 1950.

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