. A new treatise on the practice of navigation at sea : containing all the details necessary to enable the mariner to become a good practical navigator. . ble XXXIX) have been inserted. TABLE AT PAGE 18—First Part of this Work: p .g Shows the number of minutes and seconds contained in each degree, or 60 mile* ^ * of longitude^ for every degree of latitude. TABLE AT PAGE 32—First Part of this Work. Page 32. Por finding the distance of an object by two bearings and the distance sailed between th^ This table is particularly useful to coasters. TABLE AT PAGE 37—First Part of this Work. p «- Thi
. A new treatise on the practice of navigation at sea : containing all the details necessary to enable the mariner to become a good practical navigator. . ble XXXIX) have been inserted. TABLE AT PAGE 18—First Part of this Work: p .g Shows the number of minutes and seconds contained in each degree, or 60 mile* ^ * of longitude^ for every degree of latitude. TABLE AT PAGE 32—First Part of this Work. Page 32. Por finding the distance of an object by two bearings and the distance sailed between th^ This table is particularly useful to coasters. TABLE AT PAGE 37—First Part of this Work. p «- This table is used for finding the time of high water at any place by correcting for ^ * the moons horizontal parallax. TABLE AT PAGE 100—First Part of this Work. To find the Latitude from Suns change of Altitude. P inn This table contains the Suns change of altitude in one minute of time for every ^ * degree of latitude when on the Prime Vertical. TABLE AT PAGE 153—Second Part of this Work. This table contains the Suns change of altitude in one minute of time for every degree of iat>bude when not on the Prime Vertical. JAMES H. BROWNLOW. PRACTICAL NAVIGATION Navig is the art of conducting a ship from one port to another, through the wide andtrackless ocean, with the greatest safety, in the shortest time possible, and to find her position onthe globe at any given time. To be able to do this, the mariner is required to have a knowledge of certain imaginary circles,Bupposed to be drawn on the surface of the earth, together with the most practical and easymethod of finding a ships position thereon, from the course steered by the compass, and lierdistance sailed, and also the course and distance to her intended port. This constitutes what iscalled Navigating by Dead Reckoning; but as it is liable to be greatly in error, even in short dis-tances run, from many causes (which will be explained in this work), it cannot therefore safely bedepended on. Co
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