The practice of navigation and nautical astronomy. [With] Tables [and] Supplement to the first ed, Τόμος 261870 |
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Σελίδα 11
... pass back again from 4 to 3 , we must take away of 4 . 41. It may be convenient to express the change of a quantity in any ratio , by means of the increase or diminution it undergoes , measured by a fraction of itself . To increase a ...
... pass back again from 4 to 3 , we must take away of 4 . 41. It may be convenient to express the change of a quantity in any ratio , by means of the increase or diminution it undergoes , measured by a fraction of itself . To increase a ...
Σελίδα 25
... passes , and put one foot on D and the other on the arc at F , and join PF : then the angle FPD is equal to BAC , their measures , FD and B C , being the same . B E F C D 96. PROBLEM . From a point M , in a straight line A M , to draw a ...
... passes , and put one foot on D and the other on the arc at F , and join PF : then the angle FPD is equal to BAC , their measures , FD and B C , being the same . B E F C D 96. PROBLEM . From a point M , in a straight line A M , to draw a ...
Σελίδα 29
... pass through them ; for an infinite number of circles may be drawn passing through two points , and therefore some one of these must likewise pass through a third point wherever situated . 3. Use and Construction of the Scales . 104 ...
... pass through them ; for an infinite number of circles may be drawn passing through two points , and therefore some one of these must likewise pass through a third point wherever situated . 3. Use and Construction of the Scales . 104 ...
Σελίδα 41
... passes clear of the arc A B ) , ACB is the difference of BCE and A CE , and is double of A D B , the difference of B D E and A D E. When E falls on AB , as in fig . 2 , ACB is the sum of ACE and BCE , and is double the sum of the angles ...
... passes clear of the arc A B ) , ACB is the difference of BCE and A CE , and is double of A D B , the difference of B D E and A D E. When E falls on AB , as in fig . 2 , ACB is the sum of ACE and BCE , and is double the sum of the angles ...
Σελίδα 61
... pass from any distant object on the earth suffer a change in their direction , which is called the terrestrial refraction , by which the object appears in general higher than its true place . This effect is , on the average , about of ...
... pass from any distant object on the earth suffer a change in their direction , which is called the terrestrial refraction , by which the object appears in general higher than its true place . This effect is , on the average , about of ...
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...