A guide book to the Local marine board examination. The ordinary examination. [With] The requisite elements from the Nautical almanac for 1865, for the exercises in Ainsley's Guide book, Volumen24 |
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Página 103
... steered . The former is distinguished as the True Course , the latter as the Compass Course . The course steered is the angle between the meridian and the ship's head . The course made good is the angle between the meridian and the ...
... steered . The former is distinguished as the True Course , the latter as the Compass Course . The course steered is the angle between the meridian and the ship's head . The course made good is the angle between the meridian and the ...
Página 104
... steered by such compass is magnetic in a certain sense , it has been deemed necessary to distinguish these when corrected for deviation as correct magnetic courses . 163. Compass Course is the angle which the track of the ship makes ...
... steered by such compass is magnetic in a certain sense , it has been deemed necessary to distinguish these when corrected for deviation as correct magnetic courses . 163. Compass Course is the angle which the track of the ship makes ...
Página 115
... steers the ship so that a line parallel to the keel passes over the centre of the card , and the point prescribed as the course . Care is taken to place the box so that the lubber's point in the bowl and the centre of the card are in a ...
... steers the ship so that a line parallel to the keel passes over the centre of the card , and the point prescribed as the course . Care is taken to place the box so that the lubber's point in the bowl and the centre of the card are in a ...
Página 118
... steered may deceive the seaman by seeming right to the fraction of a degree , but which avails little if the card itself is wrong half a point , and the ship in consequence hazarded . In the opinion of the writer , the present Admiralty ...
... steered may deceive the seaman by seeming right to the fraction of a degree , but which avails little if the card itself is wrong half a point , and the ship in consequence hazarded . In the opinion of the writer , the present Admiralty ...
Página 120
... steered by compass , to reduce it to the true course ; and the converse . These are called I. The Leeway . 2 . The Variation of the Compass . 191 . 3. The Deviation of the Compass . I. LEEWAY . The angle included between the direction ...
... steered by compass , to reduce it to the true course ; and the converse . These are called I. The Leeway . 2 . The Variation of the Compass . 191 . 3. The Deviation of the Compass . I. LEEWAY . The angle included between the direction ...
Términos y frases comunes
A.M. at ship altitude sun's L.L. angle bearing by compass Bearing of Distant Brest central line chart chronometer showed column common logarithms compass course correct magnetic bearing correct magnetic course corresponding cosec cosine course and distance curve cyphers decl declination departure Deviation Required diff difference of latitude difference of longitude Distant Object Divide divisor East error of compass EXAMPLES FOR PRACTICE figure given gives hour-angle Greenwich date Greenwich mean Head by Standard height of eye high water hour-angle 3h hundred index corr index correction mantissa mean noon miles Multiply Nautical Almanac needle noon at Greenwich NORIE North Object by Standard observed altitude sun's observed meridian altitude parallel parallel sailing quotient Raper remainder required the latitude Rule sailing semid sextant ship's head sine South Standard Compass steered subtracted Table tide true alt True altitude true azimuth true course West
Pasajes populares
Página 59 - The Logarithm of a number to a given base is the index of the power to which the base must be raised to give the number. Thus if m = a", x is called the logarithm of m to the base a.
Página 2 - He must understand the use of the sextant, and be able to observe with it, and read off the arc. In SEAMANSHIP. — He must give satisfactory answers as to the rigging and unrigging of ships, stowing of holds, &c. ; must understand the measurement of the log-line, glass, and lead-line ; be conversant with the rule of the road, as regards both steamers and sailing vessels, and the lights carried by them.
Página 39 - PROOF. — Multiply the divisor by the quotient, and to the product add the remainder, if any.
Página 146 - ... 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 229 - AVhen this time is exactly one of the instants for which the required quantity is put down in the Ephemeris, nothing more is necessary than to transcribe the quantity as there put down. But when, as is mostly the case, the time falls between two of the times in the Ephemeris, we must obtain the required quantity by interpolation. To facilitate this interpolation, the Ephemeris contains the rate of change, or difference of each of the quantities in some unit of time.
Página 378 - Compass to make the following courses, correct magnetic. 9. Supposing you have steered the following courses by the Standard Compass, find the correct magnetic courses made from the above deviation table.
Página 103 - The COURSE steered is the angle between the meridian and the ship's head. The course made good is the angle between the meridian and the ship's real track on the surface of the sphere. The course is reckoned from the north, towards the east or west, when the ship's Ivead is less than eight points from the north point. The same applies to the south point. The course is measured in points of 11° 15' each, or in degrees and minutes.
Página 2 - Testimonials of character, and of sobriety, experience, ability, and good conduct on board ship, will be required of all applicants, and without producing them no person will be examined. As such testimonials...
Página 386 - To be added when the greater reading is off the arc, and subtracted when the greater reading is on the arc. 14.
Página 378 - With the deviation as above, give the courses you would steer by the Standard Compass to make the following courses, correct magnetic : — . . 9.