Mexico and Central America Pilot (Pacific Coast) from the United States to Colombia Including the Gulfs of California and Panama

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U.S. Government Printing Office, 1918 - 415 Seiten
 

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Seite 19 - For boarding a wreck, it is recommended to pour oil overboard to windward of her before going alongside. The effect in this case must greatly depend upon the set of the current, and the circumstances of the depth of water.
Seite 4 - 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 has been found. The chart on largest scale should always be used on account of its greater detail and the greater accuracy with which positions may be plotted on it. Caution in using small-scale charts. — In approaching the land or dangerous banks, regard must always be had to the scale of the chart...
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. The...
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 18 - Use of Oil for Modifying the Effect of Breaking Waves. — Many experiences of late years have shown that the utility of oil for this purpose is undoubted, and the application simple. The following may serve for the guidance of seamen, whose attention is called to the fact that a very small quantity of oil...
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.
Seite 6 - The power of a light can be estimated by remarking its order, as given in the Light Lists, and in some cases by noting how much its visibility in clear weather falls short of the range due to the height at which it is placed. Thus, a light standing 200 feet above the sea and...
Seite 19 - For a boat riding in bad weather from a sea anchor, it is recommended to fasten the bag to an endless line rove through a block on the sea anchor, by which means the oil is diffused well ahead of the boat, and the bag can be readily hauled on board for refilling if necessary.

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