G - Physics – 09 – B
Patent
G - Physics
09
B
235/2
G09B 29/00 (2006.01) G09B 27/04 (2006.01)
Patent
CA 1090750
ABSTRACT OF THE DISCLOSURE A planisphere including a navigation west and east dial and scales, sky map, Greenwich and transit indicator dials having an Aries indicator, a Greenwich indicator and a transit scale indicator respectively thereon, and a refer- ence rule, constructed and arranged to facilitate programming of the elements thereof to provide an automatic computerized reading directly of local hour angle of stars from a local hour angle scale on the sky mask dial for entering sight reduction tables for navigation purposes. The planisphere also includes specific time zone indications to facilitate correct programming thereof and a declination scale on the reference indicator for determining declination of stars. The transit scale indicator includes opaque and transparent portions arranged so that scales of the planisphere are completely visible on one side or the other of the plani- sphere. The planisphere includes similar dials, scales and indicators on opposite sides thereof, with the dials and scales so related and the indicators connected together at the outer end thereof, whereby a double check of the pro- gramming of the planisphere is possible. The opposite sides of the planisphere are in ground position and overhead configuration, respectively.
297008
Eisenhauer Manufacturing Company (the)
Macrae & Co.
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