United States Coast Pilot 9: Alaska (Google eBook)

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U.S. Government Printing Office, 1916 - Pilot guides
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Page 12 - The glare of a powerful light is often seen far beyond the limit of visibility of the actual rays of the light, but this must not be confounded with the true range.
Page 19 - For boarding a wreck, it is recommended to pour oil overboard to windward of her before going alongside. The...
Page 19 - ... 11. 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 can be diffused well ahead of the boat and the bag readily hauled on board for refilling, if necessary.
Page 18 - On free waves, ie, waves in deep water, the effect is greatest. 2. In a surf, or waves breaking on a bar, where a mass of liquid is in actual motion in shallow water, the effect of the oil is uncertain, as nothing can prevent the larger waves from breaking under such circumstances, but even here it is of some service.
Page 15 - The xylonite protractor also permits the laying down for simultaneous trial of a number of angles in cases of fixing important positions. Plain tracing paper may also be used if there are any suitable means of laying off the angles. The value of a determination depends greatly on the relative positions of the objects observed. If the position sought lies on the circle passing through...
Page 12 - ... be had to the scale of the chart used. A small error in laying down a position means only yards on a large-scale chart, whereas on a small scale the same amount 01 displacement means large fractions of a mile.
Page 17 - ... between them; or by drawing to the position obtained with one latitude a line at right angles to the bearing of the body as taken from the azimuth tables.
Page 18 - In cold water, the oil, being thickened by the lower temperature, and not being able to spread freely, will have its effect much reduced. This will vary with the description of oil used.
Page 16 - 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...
Page 17 - ... of magnetic force of an amount absolutely unknown to affect a compass half a mile distant. Such deflections of the compass are due to magnetic minerals in the bed of the sea under the ship, and when the water is shallow, and the force strong, the compass may be...

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