Polaris axis finder

Details Polaris axis finder Polaris axis finder

1981-08-31

1984-03-13

Punter, William H.

Optics: measuring and testing

Angle measuring or angular axial alignment

Alignment of axes nominally coaxial

33268, 350568, G01B 1126, G01C 1734

Patent

active

044364210

ABSTRACT:
A polar axis finder for an equatorial mounting telescope has an objective lens and a focus mirror having a Polaris collimating mark thereon disposed at a focal point of the objective lens. A time scale cylinder has a time scale thereon and the focus mirror is fixedly mounted within one end portion thereof. The time scale cylinder and the focus mirror can be rotated relative to a month scale cylinder having a date scale and an autumnal equinox point mark thereon, the latter being placed in alignment with a corresponding index provided on the telescope whereby polar axis alignment can be readily achieved with high accuracy.

REFERENCES:
patent: 2527189 (1950-10-01), Kittelson
patent: 3052986 (1962-09-01), Merchant
patent: 3840284 (1974-10-01), Rand
patent: 4260253 (1981-04-01), Tuthill
Fox, J. E., "A Star Finder for the Space Age", Popular Science, vol. 179, 12-1961, pp. 115-119.

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