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1 UTTMARK, F.E., Captain Marc St. Hilaire Method for Finding a Ship's Position at Sea. no dj.
UTTMARK, F.E., Captain. Marc St. Hilaire Method for Finding a Ship's Position at Sea. NY: The author, (1919). Pp 38. 4to, blue cloth. "In the Marc St. Hilaire Method we calculate what the altitude of a heavenly body, the sun, the moon, planet or fixed star should be at a given instant, if seen from the assumed ship's position by Dead Reckoning. ...An altitude of the heavenly body is measured with the sextant, corrected for dip, refraction, etc., in the usual way, and the true altitude found. Unless the Dead Reckoning is correct, there will be a difference between the calculated and the true altitudes. This is called Altitude Difference or Intercept, and provides us with co-ordinates or...lines which are the means of finding the ship's correct position." Inner hinges cracked, cloth rubbed and soiled, else g. 50.00

Price: 50.00 CDN
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