Optics: measuring and testing – Angle measuring or angular axial alignment – Apex of angle at observing or detecting station
Patent
1981-10-09
1984-07-31
Punter, William H.
Optics: measuring and testing
Angle measuring or angular axial alignment
Apex of angle at observing or detecting station
356146, G01C 100, G01C 114
Patent
active
044626843
ABSTRACT:
Single wheel celestial navigational instrument and method of determination of local latitude and local hour angle of Aries by a single sighting on the night sky. Greenwich hour angle of Aries and latitude are obtained by simple reference to the instrument's scales and to a watch and Nautical Almanac; sight reduction tables, plotting boards and charts are not required. The instrument comprises a sky assembly and a horizon assembly. The sky assembly includes a closed central axial tube on which are rotatably mounted a combined periscope/telescope tube for sighting a first star and a periscope tube for sighting a second star, the sidereal hour angular positions of both of which are set with respect to a single graduated wheel and the polar distances of each periscope turret with respect to protractor scales. The horizon assembly comprises a periscope/telescope assembly mounted on the central axial tube and indexed to the same graduated (calibrated) wheel to read the local hour angle of Aries, and to a protractor scale to read the local latitude. A beam splitter, mirrors and optical lens elements are mounted to permit simultaneous observation of two stars and the horizon.
REFERENCES:
patent: 914754 (1909-03-01), Saegmuller
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patent: 3046830 (1962-07-01), Pierce et al.
patent: 3207025 (1965-09-01), MacDonald
patent: 4083636 (1978-04-01), Owen
patent: 4294541 (1981-10-01), Abler
Herrick, S. "Instrumental Solution in Celestial Navigation", Navigation vol. 1, 6-1946, pp. 22-27.
Dulin Jacques M.
Punter William H.
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