Practice of navigation and nautical astronomy, Volumen431872 - 571 páginas |
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Página 55
... , were expert in the use of this instrument ; and , in the writer's younger days , when under their command , he has often admired the skill with which they turned their vessels up Swin in a dark ERRORS OF DEAD RECKONING . 55.
... , were expert in the use of this instrument ; and , in the writer's younger days , when under their command , he has often admired the skill with which they turned their vessels up Swin in a dark ERRORS OF DEAD RECKONING . 55.
Página 56
William Culley Bergen. which they turned their vessels up Swin in a dark night , by attention to the lead . As an ... vessel , which could not be seen from the deck , but its mast heads were visible over the fog from the mast heads of ...
William Culley Bergen. which they turned their vessels up Swin in a dark night , by attention to the lead . As an ... vessel , which could not be seen from the deck , but its mast heads were visible over the fog from the mast heads of ...
Página 75
... vessels , who , when navigating within the tropics , used to take the departure for the difference of longitude . The plan is correct at the equator , and for a few degrees from it may be allowed to pass muster ; but if a ship in lat ...
... vessels , who , when navigating within the tropics , used to take the departure for the difference of longitude . The plan is correct at the equator , and for a few degrees from it may be allowed to pass muster ; but if a ship in lat ...
Página 154
... vessel containing mercury , oil , tar , or other fluid . Its use is to obtain altitudes of celestial objects , by the rays of light from them being reflected from the fluid . 13. True course of a Ship is the angle included between the ...
... vessel containing mercury , oil , tar , or other fluid . Its use is to obtain altitudes of celestial objects , by the rays of light from them being reflected from the fluid . 13. True course of a Ship is the angle included between the ...
Página 194
... vessel in the heavy sea on the bank . Again , bound to St. Thomas , a small black mark was put down to represent a small island , but there was nothing to show the height of the land . The ship was therefore hove to for the night . The ...
... vessel in the heavy sea on the bank . Again , bound to St. Thomas , a small black mark was put down to represent a small island , but there was nothing to show the height of the land . The ship was therefore hove to for the night . The ...
Términos y frases comunes
A.M. at ship anchor azimuth backstays bearing by compass bills of lading Cape captain cargo chart charter Circle common logarithms Compass Course correct magnetic course Cosec Cosine Cotang course and distance decimal Declination Degrees Diff Difference of Latitude difference of longitude Dist dunnage East EXAMPLES fast for mean feet fore freight Frid given heeling error height of eye high water hour hour angle index error Latitude and Departure leeway Logarithmic Sines longitude by chronometer MATE mean noon Mercator chart miles noon at Greenwich North observed altitude observed meridian altitude parallel parallel ruler parallel sailing port required the latitude required the longitude required the true Right Ascension rope Rule sail Secant ship's head Signal South spars standard compass staysail steered subtract sun's lower limb Table Tangent Thur tide true course Tues Variation vessel West wind yard
Pasajes populares
Página 312 - ... abaft the beam on the starboard side, and of such a character as to be visible on a dark mght, with a clear atmosphere, at a distance of at least two miles. (c.) On the...
Página 312 - ... where it can best be seen, but at a height not exceeding twenty feet above the hull, a white light in a globular lantern of eight inches in diameter, and so constructed as to show a clear uniform and unbroken light visible all round the horizon, and at a distance of at least one mile.
Página 321 - On the starboard side, a green light so constructed as to show an uniform and unbroken light over an arc of the horizon of 10 points of the compass ; so fixed as to throw the light from right ahead to 2 points abaft the beam...
Página 322 - 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. Art. 4. Steam ships when towing other ships shall carry two bright white mast-head lights vertically, in addition to their side lights, so as to distinguish them from other steam ships.
Página 322 - 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 312 - ... from right ahead to two points abaft the beam on the port side, and of such a character as to be visible at a distance of at least two miles.
Página 312 - Miles: (c.) On the Port Side, a Red Light, so constructed as to show an uniform and unbroken Light over an Arc of the Horizon of 10 Points of the Compass; so fixed as to throw the Light from right ahead to 2 Points abaft the Beam...
Página 313 - ... (c.) When both are running free, with the wind on different sides, the vessel which has the wind on the port side shall keep out of the way of the other.
Página 311 - 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 312 - ... 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.