The Practice of Navigation: And Nautical AstronomyJ. D. Potter, 1882 - 910 σελίδες |
Αναζήτηση στο βιβλίο
Αποτελέσματα 1 - 5 από τα 76.
Σελίδα 74
... port ; t also the change of local deviation does not correspond to the mere change of dip ( No. 242 ) ; and , moreover , the action of this iron on the compass is always undergoing change . Hence , if a correct account of the local ...
... port ; t also the change of local deviation does not correspond to the mere change of dip ( No. 242 ) ; and , moreover , the action of this iron on the compass is always undergoing change . Hence , if a correct account of the local ...
Σελίδα 87
... port bearing S.W. ? Draw the meridian , A S , of the ship at A. Lay off the bearing of the port , S.W. , and the Course S. 70 ° W. , and take A B to re- present the rate per hour ( or for a smaller interval ) , as 5 knots . B then is ...
... port bearing S.W. ? Draw the meridian , A S , of the ship at A. Lay off the bearing of the port , S.W. , and the Course S. 70 ° W. , and take A B to re- present the rate per hour ( or for a smaller interval ) , as 5 knots . B then is ...
Σελίδα 91
... port is drifted by a current , it is evident that , unless it be exactly with her or exactly against her , it will ... port . Case II . Given the bearing of the port , and the set and rate of the current : it is required to shape the ...
... port is drifted by a current , it is evident that , unless it be exactly with her or exactly against her , it will ... port . Case II . Given the bearing of the port , and the set and rate of the current : it is required to shape the ...
Σελίδα 92
... port on the opposite side to that towards which the current is drifting the ship , gives the course to be steered . Ex . 1. The port bears S. 52 ° W. , the current sets S.S.E. two miles an hour ; the present rate of sailing 7 knots ...
... port on the opposite side to that towards which the current is drifting the ship , gives the course to be steered . Ex . 1. The port bears S. 52 ° W. , the current sets S.S.E. two miles an hour ; the present rate of sailing 7 knots ...
Σελίδα 93
... port , the ship's velocity must evidently be equal , at least , to that of the current , that she may be able to stem it , and to preserve both the bearing and distance of the port unchanged . Hence , if the current tend in any degree ...
... port , the ship's velocity must evidently be equal , at least , to that of the current , that she may be able to stem it , and to preserve both the bearing and distance of the port unchanged . Hence , if the current tend in any degree ...
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.