New and Accurate Method of Finding a Ship's Position at Sea (Classic Reprint) - Softcover

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Excerpt from New and Accurate Method of Finding a Ship's Position at Sea

Gentlemen: Agreeably to promise, Inow write my brother, G. B. Well man, to pay you one dollar for the work of Captain Sumner, and never have I spent a. Dollar with more satisfaction, or ever got more value received for the money. I have now given the work a fair trial and am perfectly satisfied that it ist e greatest discovery in the art of Navigation since the discovery of the longitude by chronometer, by Harrison, almost a century ago, and places Capt. Sumner, if not equal, certainly only second, to Nathl. Bowditch, and I look upon it as what has been for a long time among the desiderata of Navigation. It has been a source of anxiety to the Navigator, to ascertain his latitude when meridian altitudes could not be got. The ordinary modes of double altitudes for that purpose, published in most works on Navigation, have not always ah swered the purpose sufficiently to entitle them to implicit confidence. The work of Capt. Sumner has supplied a remedy; for any one with a reasonable knowl edge of the rules and art of Navigation, can ascertain his latitude by following Capt. Sumner's rules, whether he has a chronometer or not; and if he has one, he can ascertain his latitude and longitude at any time when the sun, moon, or stars are visible, and there is a clear horizon. At the present time but few vessels are navigated without a chronometer, and Capt. Sumner has contributed to increase the value of that instrument fourfold.

I have not the honor of a personal acquaintance with Capt. Sumner, but he is one of those web-foots whose acquaintance I should feel an edifying pleas ure in cultivating; at the same time, I am proud to see ahd acknowledge that this discovery has been made by an. American Ship Master. This work should be in the hand of every master of a vessel, aye, and mate too, and should be the never-failing accompaniment of Bowditch's great work on navigation.

Wishing you and Capt. Sumner every success in the sale of this work which its merits entitle it to.

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