Daboll's Practical Navigator; Being a Concise, Easy, and Comprehensive System of Navigation;... Calculated for the Daily use of Seamen, and Also for an Assistant to the Teacher:

Book Description

Samuel Green, New London, Connecticut 1820, 1st edition. "Containing Plane, Traverse, Parallel, Middle Latitude, and Mercator's Sailing; with all the Necessary Tables. Concise Rules are Given, with a Variety of Examples in Every Part of Common Navigation; also, a new, Scientific, and very short method of correcting the Dead Reckoning; with rules for keeping a complete Reckoning at Sea, applied to practice, and exemplified in three separate Journals, in which may be seen all the varieties which can probably happen in a Ship's Reckoning." 8vo, frontispiece woodcut of "The Quadrant, Reel, Log, Mariner's Compass"; 106 pps & 19 tables in next section, 104pp. Text a little browned, with slt. waterstain on 1st 4 leaves, ending with the frontis. Nicely rebacked in brown leather, black title label lettered in gold, with the orig. green cloth boards. Daboll was a teacher and almanac maker who wrote "The Schoolmaster's Assistant," the most popular mathematics text in America between 1800 and 1850. His Navigator was published two years after the author's death, but contains his method for dead reckoning which he formulated in 1799, and which method "he has ever since practised, instead of the operbose, absurd, and erroneous Rules published by Robertson, Hamilton Moore, and others."

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