American Practical Navigator, 1888


Calibrating the chronometer, Articles 260-264.


Article 260-264, American Practical Navigator, 1888



Refraction correction. Article 250, page 1 of excerpt.
Dip correction , article 251, page 1 of excerpt.
Finding longitude, complete list of methods, Article 293, pages 2-16 of excerpt.
Sumner's method, the invention of the Line Of Position, Article 314, pages 17-28 of excerpt.

Articles 250, 251 &  293-322, American Practical Navigator, 1888



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Gary LaPook,
Jun 2, 2011, 1:21 AM
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Gary LaPook,
May 30, 2011, 11:26 PM
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