The practice of navigation and nautical astronomy. [With] Tables [and] Supplement to the first ed, Volum 261870 |
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Side 11
... measured by a fraction of itself . To increase a number in the ratio of . is composed of and , or land ; hence the number is to be increased by of itself . To diminish a number in the ratio of . is equivalent to 5 , deducting , or to 1 ...
... measured by a fraction of itself . To increase a number in the ratio of . is composed of and , or land ; hence the number is to be increased by of itself . To diminish a number in the ratio of . is equivalent to 5 , deducting , or to 1 ...
Side 23
... measured by the number of degrees in the arc A B. C 83. The arc A B is said to subtend the angle A CB . 84. An angle of 90 ° , as ACD ( fig . in No. 77 ) , which is sub- tended by a quadrant , as A D , is called a right angle . A circle ...
... measured by the number of degrees in the arc A B. C 83. The arc A B is said to subtend the angle A CB . 84. An angle of 90 ° , as ACD ( fig . in No. 77 ) , which is sub- tended by a quadrant , as A D , is called a right angle . A circle ...
Side 29
... thin pieces of brass , ivory , or wood , divided into certain portions by lines , and serve for measuring or laying off lines or distances , and angles . The common scale of equal parts has generally on one PRACTICAL GEOMETRY . 29.
... thin pieces of brass , ivory , or wood , divided into certain portions by lines , and serve for measuring or laying off lines or distances , and angles . The common scale of equal parts has generally on one PRACTICAL GEOMETRY . 29.
Side 30
... measured , or laid off , either by means of the lines marking the divisions of degrees , or half degrees , at the edge of the scale , and which are numbered at each 10 ° or 5 ° , or by means of the Scale of Chords . 510 80 ( 1. ) To ...
... measured , or laid off , either by means of the lines marking the divisions of degrees , or half degrees , at the edge of the scale , and which are numbered at each 10 ° or 5 ° , or by means of the Scale of Chords . 510 80 ( 1. ) To ...
Side 31
... measured or laid off exceeds 90 ° , measure or lay off 90 ° , and then the excess above 90 ° . 108. The semicircle with a graduated edge is useful for this purpose ; but the most convenient instrument , especially for using with the ...
... measured or laid off exceeds 90 ° , measure or lay off 90 ° , and then the excess above 90 ° . 108. The semicircle with a graduated edge is useful for this purpose ; but the most convenient instrument , especially for using with the ...
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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...