The practice of navigation and nautical astronomy. [With] Tables [and] Supplement to the first ed, Volum 261870 |
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Side v
... circle . The study of its contents demands no previous attainments beyond the knowledge of the elements of arithmetic . Every endeavour has been made to render the whole easy of reference , and to adapt it to the use of those who may ...
... circle . The study of its contents demands no previous attainments beyond the knowledge of the elements of arithmetic . Every endeavour has been made to render the whole easy of reference , and to adapt it to the use of those who may ...
Side vi
... Circle is , in this work , reduced , like Plane Sailing , to Inspection , by means of the SPHERICAL TRAVERSE TABLE . Convenient rules are given for finding the distance of the land y its change of bearing , and by its altitude observed ...
... Circle is , in this work , reduced , like Plane Sailing , to Inspection , by means of the SPHERICAL TRAVERSE TABLE . Convenient rules are given for finding the distance of the land y its change of bearing , and by its altitude observed ...
Side xvii
... CIRCLE SAILING .... 95 105 IV . TAKING Departures .. 114 ... I. BY A SINGLE BEARING AND DISTANCE 114 II . DETERMINATION OF DISTANCE III . METHODS BY THE CHART .... 114 120 V. CHARTS 122 I. USE OF MERCATOR'S CHART II . CONSTRUCTION OF ...
... CIRCLE SAILING .... 95 105 IV . TAKING Departures .. 114 ... I. BY A SINGLE BEARING AND DISTANCE 114 II . DETERMINATION OF DISTANCE III . METHODS BY THE CHART .... 114 120 V. CHARTS 122 I. USE OF MERCATOR'S CHART II . CONSTRUCTION OF ...
Side 22
... circle , and C the centre . B .C 75. The circumference is divided into 360 equal parts , called degrees , written ... circle and circumference are often used indifferently the one for the other , but circle is properly the surface or ...
... circle , and C the centre . B .C 75. The circumference is divided into 360 equal parts , called degrees , written ... circle and circumference are often used indifferently the one for the other , but circle is properly the surface or ...
Side 23
... circle into two equal parts , the four equal parts , A D , B D , BE , E A , are called quadrants , and each of such portions of the circum- ference measures 90 ° . 80. Any portion of the circumference is called an arc , and the line ...
... circle into two equal parts , the four equal parts , A D , B D , BE , E A , are called quadrants , and each of such portions of the circum- ference measures 90 ° . 80. Any portion of the circumference is called an arc , and the line ...
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Vanlige uttrykk og setninger
add the log altitude alts appears azim azimuth bearing called celestial body celestial equator centre chart chronometer circle colat compass Computation corr correction cosec Course and Distance D.Lat decimal decl declination deviation diff difference direction Dist divided employed equal equator error exceeds feet find the Course fraction given gives greater Greenwich Date height of eye Hence horizon interval latitude less logarithms longitude magnetic magnetic bearing measured meridian miles minutes moon moon's multiplied Nautical Almanac nearly observation parallax parallel Parallel Sailing passes Plane Sailing planet pole prime vertical prop quantity radius reckoned reduce refraction result rhumb line right angles Right Ascension sailing Semid sextant shews ship side sine star subtract sum rejecting tens sun's Traverse Table triangle true true alt variation watch
Populære avsnitt
Side 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.
Side 147 - Since the apparent altitude is too great on account of refraction, and too small on account of parallax, the diff. between these quantities is the diff. between the true and apparent altitudes. This difference, or the combined effect of parallax and refraction, is called the Correction of Altitude. The moon's Corr. of Alt. is given in Table 39; that of a star is merely its refraction. 439. The SEMI-DIAMETER of a celestial body is half the angle subtended by the diameter of the visible disc. Thus...
Side 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.
Side 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.
Side 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...
Side 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.
Side 186 - A line drawn from Polaris perpendicular to the line of the Pointers, and on the opposite side to the Great Bear, passes, at 48° distance, through CAPELLA, one of the brightest stars. In this same line, about the same distance on the opposite side of the pole, is a.
Side 145 - ... of Altitude are circles parallel to the horizon. 431. ZENITH DISTANCE is the arc included between the zenith and the celestial body, or the angular distance of a body from the zenith of which that arc is the measure. The zenith distance is, therefore, the complement of the altitude to 90°, as Z A.
Side 4 - RULE. Multiply all the numerators together for a new numerator, and all the denominators for a new denominator: then reduce the new fraction to its lowest terms.
Side 358 - Frigate La Venus, 1836-9, vol. iii. p. 419) paid particular attention to this indication, and remarks that the observations generally shew a lowering of the thermometer on approaching land, but they disprove that the water on a bank is always colder.* 1039. The temperature of the sea has been observed to change several degrees, in intervals of time varying from a few hours to a day and a half previous to a change of wind, the water becoming gradually warmer when the wind was about to blow from a...