The Practice of Navigation: And Nautical AstronomyJ. D. Potter, 1882 - 910 σελίδες |
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Σελίδα viii
... watches may , by correcting defective measures , or by establishing new links of connexion , render material service to maritime geography . See Nautical Magazine , 1839 , and following years . the purpose , which it is proposed to call ...
... watches may , by correcting defective measures , or by establishing new links of connexion , render material service to maritime geography . See Nautical Magazine , 1839 , and following years . the purpose , which it is proposed to call ...
Σελίδα xviii
... WATCH IV . FINDING THE STARS IV . SUBORDINATE COMPUTATIONS I. THE GREENWICH DATE ..... II . REDUCTION OF THE ELEMENTS IN THE NAUTICAL ALMANAC .. III . CONVERSION OF TIMES IV . HOUR - ANGLES V. TIMES OF Certain PHENOMENA VI . ALTITUDES ...
... WATCH IV . FINDING THE STARS IV . SUBORDINATE COMPUTATIONS I. THE GREENWICH DATE ..... II . REDUCTION OF THE ELEMENTS IN THE NAUTICAL ALMANAC .. III . CONVERSION OF TIMES IV . HOUR - ANGLES V. TIMES OF Certain PHENOMENA VI . ALTITUDES ...
Σελίδα 64
... watch shewing seconds , gives the velocity or rate of the ship , and thence the distance run in any interval of time . I. THE COMPASS . 213. The Mariner's Compass consists of a circular card , of which the edge or circumference is ...
... watch shewing seconds , gives the velocity or rate of the ship , and thence the distance run in any interval of time . I. THE COMPASS . 213. The Mariner's Compass consists of a circular card , of which the edge or circumference is ...
Σελίδα 81
... watch , as in damp weather they are often retarded , and some- times hang altogether . One end is stopped with a cork , which is taken out to dry the sand , or to change its quantity . * In numerous passages up and down the river Plate ...
... watch , as in damp weather they are often retarded , and some- times hang altogether . One end is stopped with a cork , which is taken out to dry the sand , or to change its quantity . * In numerous passages up and down the river Plate ...
Σελίδα 133
... watch , at the close and dawn of day , and at the coming on of a fog , the land is set ; so that , in case of losing sight of it , a Departure may always be secured at the latest period . 409. The Weather is described at the end of each ...
... watch , at the close and dawn of day , and at the coming on of a fog , the land is set ; so that , in case of losing sight of it , a Departure may always be secured at the latest period . 409. The Weather is described at the end of each ...
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.