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 |
From inside the book
Results 1-5 of 100
Page 12
... gives 100 , whose square root is 10 , which is the sought hypotenuse . LII . If Four quantities are said to be proportional , when the magnitude of the first compared with the second is the same as the magnitude of the third compared ...
... gives 100 , whose square root is 10 , which is the sought hypotenuse . LII . If Four quantities are said to be proportional , when the magnitude of the first compared with the second is the same as the magnitude of the third compared ...
Page 25
... gives : Sine Course ( 37 ° ) : Departure ( 30 ) :: Radius ( 90 ° ) : Distance . Hence we must bring 370 on the line of sines of the fixed part against 80 on the line of numbers on the slider , then against 90 ° on the line of sines of ...
... gives : Sine Course ( 37 ° ) : Departure ( 30 ) :: Radius ( 90 ° ) : Distance . Hence we must bring 370 on the line of sines of the fixed part against 80 on the line of numbers on the slider , then against 90 ° on the line of sines of ...
Page 28
... give the chord of 20 degrees ; and if the transverse of 20 ° and 200 be in like manner taken on the sines , it will be ... gives the sought side BC = 88 . In the same manner we might solve any problem in trigonometry , where the tangents ...
... give the chord of 20 degrees ; and if the transverse of 20 ° and 200 be in like manner taken on the sines , it will be ... gives the sought side BC = 88 . In the same manner we might solve any problem in trigonometry , where the tangents ...
Page 29
... gives 49 , crossing off the right hand figure leaves 4.9 or 5 to be added to 81258 , which makes 81263 , to this prefixing the index 4 , we have the sought logarithm 4.81263 . Again , if the logarithm of 6495738 was required ; the ...
... gives 49 , crossing off the right hand figure leaves 4.9 or 5 to be added to 81258 , which makes 81263 , to this prefixing the index 4 , we have the sought logarithm 4.81263 . Again , if the logarithm of 6495738 was required ; the ...
Page 30
... gives 5166 , crossing off the three right hand figures of this product ( because the number 738 consists of three figures ) we have the correction 5 to be added to 81258 ; and the index to be prefixed is 6 because the given number con ...
... gives 5166 , crossing off the three right hand figures of this product ( because the number 738 consists of three figures ) we have the correction 5 to be added to 81258 ; and the index to be prefixed is 6 because the given number con ...
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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.