The New American Practical Navigator: Being an Epitome of Navigation; Containing All the Tables Necessary to be Used with the Nautical Almanac, in Determining the Latitude, and the Longitude by Lunar Observations ... : With an Appendix Containing Methods of Calculating Eclipses of the Sun and Moon ...Edmund M. Blunt, Proprietor and author of the American coast pilot ; John Gray & Company, Print., 1826 - Nautical astronomy - 617 pages |
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Page vi
... miles . TABLE IV . contains the declination of the sun , which was compared with the Nautical Almanacs for the years 1824 , 1825 , 1826 , and 1827 , and mark- ed to the nearest minute . TABLE IV . A. The Equation of Time , for the years ...
... miles . TABLE IV . contains the declination of the sun , which was compared with the Nautical Almanacs for the years 1824 , 1825 , 1826 , and 1827 , and mark- ed to the nearest minute . TABLE IV . A. The Equation of Time , for the years ...
Page vii
... miles or minutes , d the distance of the land in sea miles , and h the height of the eye of the observer in feet . TABLES XVII . XVIII . and XIX . were first calculated by the author of this work , and published in the Appendix to the ...
... miles or minutes , d the distance of the land in sea miles , and h the height of the eye of the observer in feet . TABLES XVII . XVIII . and XIX . were first calculated by the author of this work , and published in the Appendix to the ...
Page 1
... Miles . 26.7 32.15 EXAMPLES . Feet . 1.26 2.31 Inches . 272.3267 .0134 2.1576 3T2 115.206 .008 Sum 202.059 1.785 2.0 7.355 31.4 305.8977 SUBTRACTION OF DECIMALS . Subtraction of decimals is performed in Decimal Arithmetic.
... Miles . 26.7 32.15 EXAMPLES . Feet . 1.26 2.31 Inches . 272.3267 .0134 2.1576 3T2 115.206 .008 Sum 202.059 1.785 2.0 7.355 31.4 305.8977 SUBTRACTION OF DECIMALS . Subtraction of decimals is performed in Decimal Arithmetic.
Page 24
... miles in 4 hours , how many miles will she sail in 12 hours at the same rate ? Bring 4 on the line of numbers of the fixed part against 25 on the line of numbers of the slider , then against 12 on the fixed part will be found 75 on the ...
... miles in 4 hours , how many miles will she sail in 12 hours at the same rate ? Bring 4 on the line of numbers of the fixed part against 25 on the line of numbers of the slider , then against 12 on the fixed part will be found 75 on the ...
Page 25
... miles . If the course is given in degrees , you must use the line marked Sin . EXAMPLE 2. Given the diff . of lat . 40 miles , and departure 30 miles — re- quired the course and distance ? By case 6 , of Plane Sailing , we have this ...
... miles . If the course is given in degrees , you must use the line marked Sin . EXAMPLE 2. Given the diff . of lat . 40 miles , and departure 30 miles — re- quired the course and distance ? By case 6 , of Plane Sailing , we have this ...
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Common terms and phrases
anchor angular distance apparent altitude arch azimuth bearing calculation central index centre chronometer circle co-sec co-sine column compass corresponding course sailed degrees diameter Diff difference of latitude difference of longitude Dist divided draw elapsed equal equator error EXAMPLE feet Funchal given gives Greenwich half sum horizon glass hour angle hypotenuse instrument latitude and departure line of numbers logarithm mean meridian altitude method middle latitude miles minutes moon moon's multiplied Nautical Almanac nearly noon object observed altitude obtained parallax parallel passing the meridian perpendicular Plane Sailing points poles quadrant radius 90 refraction right ascension rule sea account secant semi-diameter sextant ship ship's side sine square star subtracted sun's declination sun's lower limb Suppose taken tangent telescope tion TRAVERSE TABLE triangle true altitude true distance tude variation watch wind zenith distance
Popular passages
Page 10 - The angle in a semicircle is a right angle ; the angle in a segment greater than a semicircle is less than a right angle ; and the angle in a segment less than a semicircle is greater than a right angle.
Page 5 - In a right triangle, the side opposite the right angle is called the hypotenuse, and the other two sides the legs.
Page 187 - If the vessel be double-decked, take the length thereof from the fore part of the main stem, to the after part of the stern post, above the upper deck"; the breadth thereof at the broadest part above the main wales...
Page 28 - To find the logarithm of a vulgar fraction. RULE. Subtract the logarithm of the denominator from the logarithm of the numerator...
Page 240 - Sear up, or bear away, is to change the course of a ship, in order to make her run before the wind...
Page 13 - TO THEIR DIFFERENCE ; So IS THE TANGENT OF HALF THE SUM OF THE OPPOSITE ANGLES', To THE TANGENT OF HALF THEIR DIFFERENCE.
Page 205 - The cause of the tides is the unequal attraction of the sun and moon upon different parts of the earth. For they attract the parts of the earth's surface nearest to them, with a greater force than they do its centre : and attract the centre more than they do the opposite surface. To restore this equilibrium the waters take a spheroidal figure, whose longer axis is directed towards the attracting luminary.
Page 187 - ... take the depth from the under side of the deck plank to the ceiling in the hold, then multiply and divide as aforesaid, and the quotient shall be deemed the tonnage.
Page 6 - CO-SINE of an arch is the sine of the complement of that arch, or of what that arch wants of a quadrant ; thus AH being a quadrant, the arch SH is the complement of the arch AS ; SZ is the sine of the arch SH, or the co-sine of the arch AS. XXI. The VERSED SINE of an arch is that part of the diameter...
Page 91 - The index and horizon glasses must be perpendicular to the plane of the instrument, and their planes parallel to each other, when the index division of the vernier is at 0° on the arc ; and the optical axis of the telescope must be parallel to the plane of the instrument. We shall speak separately of each of these adjustments.