A guide book to the Local marine board examination. The ordinary examination. [With] The requisite elements from the Nautical almanac for 1865, for the exercises in Ainsley's Guide book |
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Página 158
... altitude observed from the sea - horizon with a quadrant or a sextant , & c . , to the true altitude , con- sist of the index correction , the dip , the correction of altitude , or the joint effect of refraction and parallax , and , in ...
... altitude observed from the sea - horizon with a quadrant or a sextant , & c . , to the true altitude , con- sist of the index correction , the dip , the correction of altitude , or the joint effect of refraction and parallax , and , in ...
Página 159
... altitude is called the " observed altitude . " There are certain instrumental and circumstantial sources of error by ... true altitude ; " it may be deduced from the apparent altitude by applying the corrections called " corrections for ...
... altitude is called the " observed altitude . " There are certain instrumental and circumstantial sources of error by ... true altitude ; " it may be deduced from the apparent altitude by applying the corrections called " corrections for ...
Página 160
... true altitude . Raper . Norie . Obs . alt . sun's L.L. Index correction + 39 ° 8 ' 30 " 33 Obs . alt . sun's L.L. Index correction 39 ° 8 ' 30 " + 33 - Dip ( Table 30. ) App . alt ... altitude 160 CORRECTION OF THE OBSERVED ALTITUDE .
... true altitude . Raper . Norie . Obs . alt . sun's L.L. Index correction + 39 ° 8 ' 30 " 33 Obs . alt . sun's L.L. Index correction 39 ° 8 ' 30 " + 33 - Dip ( Table 30. ) App . alt ... altitude 160 CORRECTION OF THE OBSERVED ALTITUDE .
Página 161
... altitude 12 51 43 356 - 4 3 12 47 47 12 47 32 Semi - diameter 15 49 Semi - diameter True altitude - 15 49 True altitude 12 3158 12 31 43 1. 1872 , Jan. 29th , EXAMPLES FOR PRACTICE . Obs . alt , sun's L.L. 17 ° 44 ′ 30 " Index corr . 1 ...
... altitude 12 51 43 356 - 4 3 12 47 47 12 47 32 Semi - diameter 15 49 Semi - diameter True altitude - 15 49 True altitude 12 3158 12 31 43 1. 1872 , Jan. 29th , EXAMPLES FOR PRACTICE . Obs . alt , sun's L.L. 17 ° 44 ′ 30 " Index corr . 1 ...
Página 162
... true altitude ( Rule LX , page 159 ) ; subtract true altitude from 90 ° : the result will be the true zenith distance . * 4 ° . Call the zenith distance N. , when the observer is North of sun , or when the sun bears South ; call zenith ...
... true altitude ( Rule LX , page 159 ) ; subtract true altitude from 90 ° : the result will be the true zenith distance . * 4 ° . Call the zenith distance N. , when the observer is North of sun , or when the sun bears South ; call zenith ...
Términos y frases comunes
A.M. at ship acct altitude sun's L.L. anchor bearing by compass charter-party chronometer column common logarithms compass course cosec cosine course and distance cyphers daily decimal point decl declination deviation difference of latitude difference of longitude dunnage East equator error EXAMINATION EXAMPLES FOR PRACTICE eye 18 feet fast fathoms fixed light Flags given Green Greenwich date Greenwich mean haul height of eye helm high water hour-angle Hourly diff index corr index correction June leeway London Bridge longitude by chronometer mantissa master miles minutes Multiply Nautical Almanac Norie North observed altitude sun's observed meridian altitude P.M. tides parallel sailing Polar dist port Raper required the latitude Rule sail secant Semi-diameter semid set by compass sextant side Signal sine South starboard subtract True altitude true azimuth true course Variation 2 points vessel West wind yard
Pasajes populares
Página 303 - 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.
Página 302 - ... abaft the beam on the starboard side, and of such a character as to be visible at a distance of at least two miles.
Página 309 - 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 302 - On the starboard side a green light so constructed as to show an unbroken light over an arc of the horizon of...
Página 302 - In the following rules every steam vessel which is under sail and not under steam is to be considered a sailing vessel, and every vessel under steam, whether under sail or not, is to be considered a steam vessel. The words "steam vessel" shall include any vessel propelled by machinery. A vessel is "under way...
Página 314 - 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 309 - Whenever, as in the case of small vessels under way during bad weather, the green and red side lights cannot be fixed, these lights shall be kept at hand, lighted and ready for 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...
Página 303 - Lights required for other Vessels ; but shall, if they do not carry such Lights, carry a Lantern having a Green Slide on the One Side, and a Red Slide on the other Side ; and on the Approach of or to other Vessels, such Lantern shall be exhibited in sufficient time to prevent Collision, so that the Green Light shall not be seen on the Port Side, nor the Red Light on the Starboard Side.
Página 336 - The names of every seaman or apprentice who ceases to be a member of the crew, otherwise than by death, with the place, time, manner, and cause thereof.
Página 302 - ... which is under steam, whether under sail or not, is to be considered a ship under steam. Rules concerning Lights (a).