NavigationW. & R. Chambers, 1867 - 458 páginas |
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Página 38
... Sine rhumbs , marked S. R. , corresponding to the logarithms of the natural sines of every point of the mariner's compass , numbered from the left hand towards the right , with 1 , 2 , 3 , 4 , 5 , 6 , 7 , to 8 , where is a brass pin ...
... Sine rhumbs , marked S. R. , corresponding to the logarithms of the natural sines of every point of the mariner's compass , numbered from the left hand towards the right , with 1 , 2 , 3 , 4 , 5 , 6 , 7 , to 8 , where is a brass pin ...
Página 46
... sine , or tangent of any arc to the radius AD , BC will be the same to the radius AB . Use of the line of Lines . 106. The line of lines is useful to divide a given line into any number of equal parts , or in any proportion , or to find ...
... sine , or tangent of any arc to the radius AD , BC will be the same to the radius AB . Use of the line of Lines . 106. The line of lines is useful to divide a given line into any number of equal parts , or in any proportion , or to find ...
Página 48
... sine , & c . , of an arc to that radius ; thus , suppose the chord , sine , or tangent of 20 ° to a radius of 2 inches be required : Make 2 inches the transverse opening from 60 ° to 60 ° on the chords ; then will the same extent reach ...
... sine , & c . , of an arc to that radius ; thus , suppose the chord , sine , or tangent of 20 ° to a radius of 2 inches be required : Make 2 inches the transverse opening from 60 ° to 60 ° on the chords ; then will the same extent reach ...
Página 49
... sine , tangent , or secant , be given , the degrees corresponding to that line may be found by setting the sector to the given radius , according as a sine , tangent , or secant is concerned ; then taking the given line between the ...
... sine , tangent , or secant , be given , the degrees corresponding to that line may be found by setting the sector to the given radius , according as a sine , tangent , or secant is concerned ; then taking the given line between the ...
Página 50
... sine B : sine △ C , and as sine B : sine A :: AC : BC . Therefore to work these proportions by the sector , take the lateral distance 64 AC from the line of c lines , and open the sector to make this a transverse distance at 46 ° 30 ...
... sine B : sine △ C , and as sine B : sine A :: AC : BC . Therefore to work these proportions by the sector , take the lateral distance 64 AC from the line of c lines , and open the sector to make this a transverse distance at 46 ° 30 ...
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Términos y frases comunes
anchor apparent altitude barometer called Cape Cape Clear centre chords chronometer column common logarithms corrected cosec course and distance course steered decimal departure dept difference of latitude difference of longitude dist distance sailed divided equation Example extent will reach find the course given GUNTER'S SCALE hence horizon hypotenuse index error latitude and longitude latitude arrived leeway line of numbers logarithms mast middle latitude miles moon's multiplied Nautical Almanac observed altitude October 20 parallax parallel Parallel Sailing perpendicular place of observation plane Plane Sailing points polar distance port tack quantities quotient radius required the course required the latitude required the true right ascension rope secant semidiameter sextant ship from latitude ship sails ship's side slider starboard tack subtract sun's declination tangent true altitude true course true distance variation vessel wind
Pasajes populares
Página 395 - Nothing in these rules shall exonerate any ship, or the owner, or master, or crew thereof, from the consequences of any neglect to carry lights or signals, or of any neglect to keep a proper look.out, or of the neglect of any precaution which may be required by the ordinary practice of seamen, or by the special circumstances of the case.
Página 395 - In obeying and construing these rules due regard must be had to all dangers of navigation ; and due regard must also be had to any special circumstances which may exist in any particular case rendering a departure from the above rules necessary in order to avoid immediate danger.
Página 394 - Every steamship, when approaching another ship so as to involve risk of collision, shall slacken her speed, or if necessary stop and reverse ; and every steamship shall, when in a fog, go at a moderate speed.
Página 391 - ... abaft the beam on the starboard side, and of such a character as to be visible at a distance of at least 2 miles. (c.) On the...
Página 392 - ... use : and shall, on the approach of or to other vessels, be exhibited on their respective sides in sufficient time to prevent collision, in such manner as to make them most visible, and so that the green light shall not be seen on the port side nor the red light on the starboard side, nor, if practicable, more than two points abaft the beam on their respective sides.
Página 392 - ... so constructed as to show a clear, uniform, and unbroken light visible all around the horizon at a distance of at least one mile.
Página 392 - The said green and red side lights shall be fitted with inboard screens projecting at least three feet forward from the light, so as to prevent these lights from being seen across the bow.
Página 393 - Sailing pilot vessels shall not carry the lights required for other sailing vessels, but shall carry a white light at the masthead, visible all round the horizon, and shall also exhibit a flareup light every fifteen minutes.
Página 393 - When two steam vessels are meeting end on, or nearly end on, so as to involve risk of collision, each shall alter her course to starboard so that each may pass on the port side of the other.
Página 393 - Whenever there is a fog, whether by day or night, the fog signals described below shall be carried and used, and shall be sounded at least every five minutes, viz. : (a...