The practice of navigation and nautical astronomy. [With] Tables [and] Supplement to the first ed, Nide 261870 |
Kirjan sisältä
Tulokset 1 - 5 kokonaismäärästä 61
Sivu 40
... tangent to the circle . Take any point D in AT , and join . CD ; then since CAD is a right angle , CDA is less than a right angle ( No. 127 ) , and therefore CD is greater than CA ( No. 128 ) or falls beyond the circum- ference , that ...
... tangent to the circle . Take any point D in AT , and join . CD ; then since CAD is a right angle , CDA is less than a right angle ( No. 127 ) , and therefore CD is greater than CA ( No. 128 ) or falls beyond the circum- ference , that ...
Sivu 45
... tangent is infinitely great . The tangent is less than the radius , according as the angle is less or greater than 45 ° . The cotangent is the tangent of PC n , which is the complement of PCN , and would be drawn from the extremity of ...
... tangent is infinitely great . The tangent is less than the radius , according as the angle is less or greater than 45 ° . The cotangent is the tangent of PC n , which is the complement of PCN , and would be drawn from the extremity of ...
Sivu 46
... tangent of 45 ° is equal to the radius . Let PCA ( fig . No. 160 ) be 45 ° , then CTA is also 45 ° ( No. 127 ) , hence the triangle is isosceles and the sides CA , AT are equal . COR . Hence also , by similar triangles , CNN P , or the ...
... tangent of 45 ° is equal to the radius . Let PCA ( fig . No. 160 ) be 45 ° , then CTA is also 45 ° ( No. 127 ) , hence the triangle is isosceles and the sides CA , AT are equal . COR . Hence also , by similar triangles , CNN P , or the ...
Sivu 161
... tangent - screw , clamp the index , and make the contact perfect by turning the screw , some further remarks on which will be made in the proper places . use . The tangent - screw should be kept nearly middled when not in 490. To take ...
... tangent - screw , clamp the index , and make the contact perfect by turning the screw , some further remarks on which will be made in the proper places . use . The tangent - screw should be kept nearly middled when not in 490. To take ...
Sivu 164
... tangent - screw right and left alternately , in making successive con- tacts , by which a partial compensation is obtained . This source of discrepancy is , however , effectually removed by taking all observa- tions , including that for ...
... tangent - screw right and left alternately , in making successive con- tacts , by which a partial compensation is obtained . This source of discrepancy is , however , effectually removed by taking all observa- tions , including that for ...
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The Practice Of Navigation And Nautical Astronomy. [with] Tables [and ... Henry Raper Esikatselu ei käytettävissä - 2019 |
The Practice Of Navigation And Nautical Astronomy. [with] Tables [and ... Henry Raper Esikatselu ei käytettävissä - 2022 |
Yleiset termit ja lausekkeet
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
Suositut otteet
Sivu 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.
Sivu 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...
Sivu 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.
Sivu 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.
Sivu 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...
Sivu 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.
Sivu 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.
Sivu 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.
Sivu 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.
Sivu 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...