A Treatise on Trigonometry, Plane and Spherical: With Its Application to Navigation and Surveying, Nautical and Practical Astronomy and Geodesy, with Logarithmic, Trigonometrical, and Nautical Tables ...G.P. Putnam, 1851 - 372 pages |
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Page xix
... lengths of two measured degrees in distant latitudes , Prime vertical transit , Formulas for latitude , altitude , and time of observation used in prime verti- cal transits , Description of the Pulkova and Washington instruments ...
... lengths of two measured degrees in distant latitudes , Prime vertical transit , Formulas for latitude , altitude , and time of observation used in prime verti- cal transits , Description of the Pulkova and Washington instruments ...
Page 2
... length of the rule . The following is the manner of using it . Suppose that it is required to draw upon paper a line equal in length to 56 . Place one foot of a pair of dividers at the line of division marked 5 , and extend them till ...
... length of the rule . The following is the manner of using it . Suppose that it is required to draw upon paper a line equal in length to 56 . Place one foot of a pair of dividers at the line of division marked 5 , and extend them till ...
Page 4
... length , and the idea of the relative lengths of two lines is obtained by its being said that one is seven feet or yards , and the other nine . Or the just conception of the length of a single line is had by being told how many feet ...
... length , and the idea of the relative lengths of two lines is obtained by its being said that one is seven feet or yards , and the other nine . Or the just conception of the length of a single line is had by being told how many feet ...
Page 5
... length of the arc , as compared with the whole circumference , may be readily conceived , as soon as the number of degrees which it contains is mentioned . So also the magnitude of the angles subtended by these arcs will , after a ...
... length of the arc , as compared with the whole circumference , may be readily conceived , as soon as the number of degrees which it contains is mentioned . So also the magnitude of the angles subtended by these arcs will , after a ...
Page 8
... length are employed to mark more distinctly every five and every ten degrees . * The centre is marked by a notch in the straight side of the instrument , which side is a diameter of the semicircle.t 9. In order to explain the use of the ...
... length are employed to mark more distinctly every five and every ten degrees . * The centre is marked by a notch in the straight side of the instrument , which side is a diameter of the semicircle.t 9. In order to explain the use of the ...
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Common terms and phrases
altitude azimuth called celestial sphere centre circle colatitude collimation column comp computed correction corresponding cos² cosc cosec cotangent course decimal declination departure determined diagram diff difference of latitude difference of longitude divided equal equation error EXAMPLE expressed feet formula Geom given number hence horizontal hour angle hypothenuse instrument intersection limb logarithm longitude means measured meridian miles multiplied Nautical Almanac number of degrees object observed obtained parallax parallel perpendicular plane sailing plane triangle polar pole proportion quadrant quotient radius right angled triangle right ascension sailing screw secant second member semidiameter ship side opposite siderial sin a sin sin² sine and cosine sine of half solution sphere spherical triangle spherical trigonometry spirit level star subtracting supporting axis tangent telescope transit trigonometrical lines vernier vertical wire zenith distance
Popular passages
Page 204 - ... 6. The latitude of a place is its distance north or south of the equator, measured on the meridian of the place.
Page 136 - The sine of half the sum of two angles of a spherical triangle is to the sine of half their difference as the tangent of half the interjacent side is to the tangent of half the difference of the other two sides.
Page 33 - The logarithm of a number is the exponent of the power to which it is necessary to raise a fixed number, in order to produce the first number.
Page 86 - When a ray of light passes from one medium to another, it is refracted so that the ratio of the sine of the angle of incidence to the sine of the angle of refraction is equal to the ratio of the velocities in the two media.
Page 79 - In any plane triangle, the sum of any two sides is to their difference as the tangent of half the sum of the opposite angles is to the tangent of half their difference.
Page 66 - FH is the sine of the arc GF, which is the supplement of AF, and OH is its cosine ; hence, the sine of an arc is equal to the. sine of its supplement ; and the cosine of an arc is equal to the cosine of its supplement* Furthermore...
Page 219 - Then, along the horizontal line, and under the given difference of latitude, is inserted the proper correction to be added to the middle latitude to obtain the latitude in which the meridian distance is accurately equal to the departure. Thus, if the middle latitude be 37°, and the difference of latitude 18°, the correction will be found on page 94, and is equal to 0° 40'. EXAMPLES. 1. A ship, in latitude 51° 18...
Page 213 - A2,lay off the distance BC = 23 miles; in the direction parallel to A3, lay off CD = 36 ; in the direction parallel to A4, lay off DE = 12 miles ; and, lastly, in the direction parallel to A5, lay off EF = 41 ; then F will be the place of the ship at the end of the traverse ; consequently, AF will be the distance made good, and the angle FAS the direct course ; applying, therefore, the distance AF to the scale of equal parts, we shall find it reach from 0 to 62| ; and applying the distance Sa to...
Page 284 - ZP. Now, in the triangle PSS', we have given two sides and the included angle to find the third side SS', and one of the remaining angles, say the angle PSS'.
Page 13 - SINE of an arc, or of the angle measured by that arc, is the perpendicular let fall from one extremity of the arc, upon the diameter passing through the other extremity. The COSINE is the distance from the centre to the foot of the sine.