The practice of navigation and nautical astronomy. [With] Tables [and] Supplement to the first ed, Τόμος 261870 |
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Σελίδα 14
... enough , for most practical * The argument is the quantity at the side or head of the Table , for which the terms or quantities in the body of the table are given . purposes , to take a quantity , somewhere between the 14 INTRODUCTION .
... enough , for most practical * The argument is the quantity at the side or head of the Table , for which the terms or quantities in the body of the table are given . purposes , to take a quantity , somewhere between the 14 INTRODUCTION .
Σελίδα 55
... head of NAVIGA- TION ; the second , under that of NAUTICAL ASTRONOMY . 180. The earth is nearly a globe or sphere : this is proved in three ways . 1st . When a vessel is seen at a considerable distance on the sea , in any part of the ...
... head of NAVIGA- TION ; the second , under that of NAUTICAL ASTRONOMY . 180. The earth is nearly a globe or sphere : this is proved in three ways . 1st . When a vessel is seen at a considerable distance on the sea , in any part of the ...
Σελίδα 59
... head . The course made good is the angle between the meridian and the ship's real track on the surface of the sphere . The course is reckoned from the north , towards the east or west , when the ship's head is less than eight points ...
... head . The course made good is the angle between the meridian and the ship's real track on the surface of the sphere . The course is reckoned from the north , towards the east or west , when the ship's head is less than eight points ...
Σελίδα 69
... head is north , the binnacle compasses , if brought side by side , will agree , each pole of one repelling the same pole of the other equally . When the ship's head approaches the east or west , they will disturb each other , the ...
... head is north , the binnacle compasses , if brought side by side , will agree , each pole of one repelling the same pole of the other equally . When the ship's head approaches the east or west , they will disturb each other , the ...
Σελίδα 70
... head was North , correct magnetic , the binnacle compass shewed S.E. ( " Practical Illustrations of the Necessity for Ascertaining the Devia- tions of the Compass , " by Capt . E. J. Johnson , R.N. F.R.S. , London , 1847 ) . Mr. Airy ...
... head was North , correct magnetic , the binnacle compass shewed S.E. ( " Practical Illustrations of the Necessity for Ascertaining the Devia- tions of the Compass , " by Capt . E. J. Johnson , R.N. F.R.S. , London , 1847 ) . Mr. Airy ...
Άλλες εκδόσεις - Προβολή όλων
The practice of navigation and nautical astronomy. [With] Tables [and ... Henry Raper Πλήρης προβολή - 1840 |
The Practice Of Navigation And Nautical Astronomy. [with] Tables [and ... Henry Raper Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2019 |
The Practice Of Navigation And Nautical Astronomy. [with] Tables [and ... Henry Raper Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2022 |
Συχνά εμφανιζόμενοι όροι και φράσεις
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
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 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...
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 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 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 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.
Σελίδα 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.
Σελίδα 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.
Σελίδα 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.
Σελίδα 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...