North Coast of France Pilot: Including the Channel Islands

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U.S. Government Printing Office, 1917 - 642 Seiten
 

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Seite 4 - For vessels drawing less than 18 feet the edge of the sanding serves as a well-marked danger line. Charts on which no fathom curves are marked must especially be regarded with caution, as indicating that soundings were too scanty and the bottom too uneven to enable the curves to be drawn with accuracy. Isolated soundings, shoaler than surrounding depths, should always be avoided, especially if ringed around, as it is doubtful how closely the spot may have been examined and whether the least depth...
Seite 17 - The magnetic compasses placed on the charts for the purpose of facilitating the plotting become in time slightly in error, and in some cases, such as with small scales or when the lines are long, the displacement of position from neglect of this change may be of importance. The...
Seite 10 - ... the fixed arm. To plot a position, the two angles observed between the three selected objects are set on the instrument, which is then moved over the chart until the three beveled edges pass respectively and simultaneously through the three objects. The center of the instrument will then mark the ship's position, which may be pricked on the chart or marked with a pencil point through the center hole.
Seite 18 - ... the smaller classes, and to boats by modifying the action of breaking seas. The principal facts as to the use of oil are as follows: 1. On free waves, ie, waves in deep water, the effect is greatest. 2. In a surf, or waves breaking...
Seite 6 - The intrinsic power of a light should always be considered when expecting to make it in thick weather. A weak light is easily obscured by haze, and no dependence can be placed on its being seen.
Seite 11 - It is not intended that the use of the compass to fix the ship should be given up : there are many circumstances in which it may be usefully employed, but errors more readily creep into a position so fixed.
Seite 45 - ... ready for use, and shall flash or show them at short intervals to indicate the direction in which they are heading; but the green light shall not be shown on the port side nor the red light on the starboard side.
Seite 11 - ... there are many circumstances in which it may be usefully employed, but errors more readily creep into a position so fixed. Where accuracy of position is desired, angles should invariably be used, such as the fixing of a rock or shoal or of additions to a chart, as fresh soundings or new buildings. In such cases angles should be taken to several objects, the more the better; but five objects is a good number, as the four angles thus obtained prevent any errors.
Seite 10 - Near objects should be used either for bearings or angles for position in preference to distant ones, although the latter may be more prominent, as a small error in the bearing or angle or in laying it on the chart has a greater effect in misplacing the position the longer the line to be drawn. On...
Seite 6 - Again, refraction may often cause a light to be seen farther than under ordinary circumstances. When looking out for a light at night, the fact is often forgotten that from aloft the range of vision is much increased. By noting a star immediately over the light a very correct bearing may be afterwards obtained from the standard compass. The intrinsic power of a' light should always be considered when expecting to make it in thick weather.

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