The Questions of the Syllabus of Examination of Masters in the Laws of the Deviation of the Compasses of an Iron Ship ... with Their Answers, Etc

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Página 37 - This change may not show itself while the ship u upon certain courses, but must be guarded against when the course is altered. When an iron ship has been long on one course, and then is put on a new course, she is likely to err in the direction of the old course : thus a ship, after being for some time on a westerly course, and then changing to north or south, will go to the west of her new course. Besides the ordinary deviation of the compass, there is a deviation caused by the heeling of iron ships,...
Página 32 - ... 16. State to which side of the ship, in the majority of cases, is the north point of the compass drawn in the northern hemisphere ; and what effect has it on the assumed position of the ship when she is steering on northerly, and also on southerly courses ? 17. The effect being as you state, on what courses would...
Página 10 - B ? 14. If the value either of coefficient B or C be given, also the magnetic direction of the ship's head while she was being built, how by the traverse tables would you determine the approximate value of the other coefficient C or B ; and if the value of both these coefficients be given, how would you determine approximately the direction, by compass, of the ship's head whilst being built?
Página 32 - Northern hemisphere ; and what effect has it on the assumed position of the Ship when she is steering on Northerly, and also on Southerly courses ? 17. — The effect being as you state, on what courses would you keep away, and on what courses would you keep closer to the wind, in order to make good a given Compass course ? 18.
Página 37 - ... upon so long as she remains upright. Besides the ordinary deviation of the compass there is a deviation caused by the heeling of iron ships, which may increase or decrease the deviation observed when the ship is upright. Cases have been observed in which the deviation from heeling has amounted to as much as two degrees for each degree of heel of the ship, that is, without altering the real direction of the ship's head, the apparent alteration in direction has amounted to 40° by heeling the ship...
Página 19 - If not, state the reason. 45. Given the heel, the direction of the ship's head by compass, and the heeling error observed, to find the approximate heeling error, with a greater or less given heel, and with the ship's head on some other named point of the compass, the ship's magnetic latitude being in both cases the same.
Página 8 - If a moving point possess simultaneously velocities which are represented in magnitude and direction by the two sides of a parallelogram drawn from...
Página 7 - ... 3. By applying this law to all magnets, natural as well as artificial, show what would be the result on a magnetic bar or needle, freely suspended, but by weight or by the nature of its mounting constrained to preserve a horizontal position ; and what result, if so mounted, but free to move in every direction, the earth being regarded as a natural magnet ? 4.
Página 32 - Ship's head at , find the bearings, correct magnetic. 11. Name some suitable objects by which you could readily obtain 'the deviation of the Compass when sailing along the coasts of the English Channel.
Página 7 - What is meant by the deviation of the compass ? 7. Describe the sub-permanent magnetism of an iron ship, and state when and how it is acquired, and which is the sub-permanent red and which is the blue pole, and why it is called sub-permanent magnetism. 8. What is meant by