The Practice of Navigation: And Nautical AstronomyJ. D. Potter, 1882 - 910 σελίδες |
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Σελίδα viii
... given to three places only . The log . sine square of half the arc , Table 61 , universally familiar to seamen in finding the time , is given , for the convenience of this constant computation , to every second of the 12 hours . By ...
... given to three places only . The log . sine square of half the arc , Table 61 , universally familiar to seamen in finding the time , is given , for the convenience of this constant computation , to every second of the 12 hours . By ...
Σελίδα 4
... given number of times ; that is , to multiply by 3 , or to take three times , gives . Hence to multiply a fraction by a whole number is to multiply the numerator . Hence a number multiplied by a ( proper ) fraction is diminished ; thus ...
... given number of times ; that is , to multiply by 3 , or to take three times , gives . Hence to multiply a fraction by a whole number is to multiply the numerator . Hence a number multiplied by a ( proper ) fraction is diminished ; thus ...
Σελίδα 9
... given quantity contains of the next inferior denomination , and multiply the given decimal by this number ; the product is the given quantity expressed in that denomination . If this product have a decimal part , multiply this decimal ...
... given quantity contains of the next inferior denomination , and multiply the given decimal by this number ; the product is the given quantity expressed in that denomination . If this product have a decimal part , multiply this decimal ...
Σελίδα 12
... Given form , 18 : 6 Alternately , 18 : 12 : Reversing , Or , 12 4 6 12 18 6 : 4 6 : 18 In like manner , 4 18 12 4. 12 12 18 4 : 6 4 : 12 6 : 18 12 : 4 : 6 46. In a proportion , either of the mean terms is equal to the product of the ...
... Given form , 18 : 6 Alternately , 18 : 12 : Reversing , Or , 12 4 6 12 18 6 : 4 6 : 18 In like manner , 4 18 12 4. 12 12 18 4 : 6 4 : 12 6 : 18 12 : 4 : 6 46. In a proportion , either of the mean terms is equal to the product of the ...
Σελίδα 13
... given terms is to be changed , so as to suit the conditions ; and thus the solution is effected at a single step . Thus , in the above question , it is evident that the given number of yards , 20 , is to be increased in the ratio of 11 ...
... given terms is to be changed , so as to suit the conditions ; and thus the solution is effected at a single step . Thus , in the above question , it is evident that the given number of yards , 20 , is to be increased in the ratio of 11 ...
Άλλες εκδόσεις - Προβολή όλων
The Practice of Navigation and Nautical Astronomy Henry Raper Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2018 |
The Practice of Navigation and Nautical Astronomy (Classic Reprint) Henry Raper Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2017 |
The Practice of Navigation and Nautical Astronomy Henry Raper Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2018 |
Συχνά εμφανιζόμενοι όροι και φράσεις
add the log altitude alts appears azim azimuth bearing celestial body centre chron chronometer circle compass Computation corr correction cosec D.Lat Dist decimal decl declination deviation diff difference direction divided employed equal equator error exceeds extr feet given gives greater Greenwich Date height of eye Hence horizon hour-angle interval latitude less logarithms longitude lunar magnetic mean measured meridian method miles moon moon's Nautical Almanac nearly noon observation parallax parallel Parallel Sailing Plane Sailing pole port prime vertical prop quantity reckoned reduce refraction result rhumb line Right Ascension sailing Semid sextant shews ship ship's side sine star subtract sum rejecting tens sun's TRAVERSE TABLE triangle true true alt variation watch
Δημοφιλή αποσπάσματα
Σελίδα 41 - 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.
Σελίδα 19 - The characteristic of a number less than 1 is found by subtracting from 9 the number of ciphers between the decimal point and the first significant digit, and writing — 10 after the result.
Σελίδα 38 - A parallelogram is a four.sided figure, of which the opposite sides are parallel; and the diameter is the straight line joining two of its opposite angles.
Σελίδα vii - This is the more important, as very indistinct and erroneous notions prevail among practical persons on the subject of accuracy of computation ; and much time is, in consequence, often lost in computing to a degree of precision wholly inconsistent with that of the elements themselves. The mere habit of working invariably to a useless precision, while it can never advance the computer's knowledge of the subject, has the unfavourable tendency of deceiving those who are not aware of the true nature...
Σελίδα 147 - For the same body the semidiameter varies with the distance; thus, the difference of the sun's semidiameter at different times of the year is due to the change of the earth's distance from the sun; and similarly for the moon and the planets.
Σελίδα 22 - A CIRCLE is a figure bounded by a curve line called the circumference,* of which every point is at the same distance from a point within, called the centre. Thus, ABD is a circle, and C the centre.
Σελίδα 43 - ... section shall be parallel to the remaining side of the triangle. Let DE be drawn parallel to BC, one of the sides of the triangle ABC: then BD shall be to DA, as CE to EA. Join BE, CD; then the triangle BDE is equal...
Σελίδα 37 - ... the three interior angles of' a triangle are together equal to two right angles.
Σελίδα 39 - Hence it is plain that triangles on the same or equal bases, and between the same parallels, are equal, seeing (by cor.
Σελίδα 105 - The distance between two points on the surface of a sphere is the length of the minor arc of a great circle between them.