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 290
... showed August 28d 3h 20m 48 M.T.G .; suppose the observed altitude of the sun's L.L. to be 35 ° 42 ′ 40 ′′ , height of eye 16 feet : required the line of bearing when the altitude was taken , assuming the ship to be between latitudes 49 ...
... showed August 28d 3h 20m 48 M.T.G .; suppose the observed altitude of the sun's L.L. to be 35 ° 42 ′ 40 ′′ , height of eye 16 feet : required the line of bearing when the altitude was taken , assuming the ship to be between latitudes 49 ...
Página 297
... showed February 28d 23h 16m 55a M.T.G .; suppose the obs . alt . sun's L.L. 29 ° 46 ′ 50 ′′ , and again P.M. same day , when the chronometer showed February 29d 4h 13m 50s , the obs . alt . QQ sun's L.L. 15 ° 47 ' 10 ' , the Sumner's ...
... showed February 28d 23h 16m 55a M.T.G .; suppose the obs . alt . sun's L.L. 29 ° 46 ′ 50 ′′ , and again P.M. same day , when the chronometer showed February 29d 4h 13m 50s , the obs . alt . QQ sun's L.L. 15 ° 47 ' 10 ' , the Sumner's ...
Página 301
... showed January 24d 9h 14m 44 , obs . alt . sun's L.L. 9 ° 40 ' 10 " ; and again , P.M. same day , when the chronometer showed January 24d 13h 14m 30 M.T.G. , obs . alt . sun's L.L. 18 ° 31 ′ 15 ′′ , the ship having made 23 miles on a ...
... showed January 24d 9h 14m 44 , obs . alt . sun's L.L. 9 ° 40 ' 10 " ; and again , P.M. same day , when the chronometer showed January 24d 13h 14m 30 M.T.G. , obs . alt . sun's L.L. 18 ° 31 ′ 15 ′′ , the ship having made 23 miles on a ...
Página 327
... showed January 15d 22h 16m 1o M.T.G. , obs . alt . sun's L.L. 12 ° 52 ′ 30 ′′ ; again , P.M. at ship same day , when chronometer showed January 16d 2h 47m 2o , obs . alt . sun's L.L. 14 ° 1 ′ 57 ′′ , height of eye 17 feet , the ship ...
... showed January 15d 22h 16m 1o M.T.G. , obs . alt . sun's L.L. 12 ° 52 ′ 30 ′′ ; again , P.M. at ship same day , when chronometer showed January 16d 2h 47m 2o , obs . alt . sun's L.L. 14 ° 1 ′ 57 ′′ , height of eye 17 feet , the ship ...
Página 332
... showed March 27 10h 26m 248 M.T.G. , obs . alt . sun's L.L. 36 ° 38 ′ 50 ′′ ; again , P.M. same day , when chronometer showed March 27d 16h 37m 10s , obs . alt . sun's L.L. 15 ° 15 ′ 20 ′′ , height of eye 22 feet , the ship having made ...
... showed March 27 10h 26m 248 M.T.G. , obs . alt . sun's L.L. 36 ° 38 ′ 50 ′′ ; again , P.M. same day , when chronometer showed March 27d 16h 37m 10s , obs . alt . sun's L.L. 15 ° 15 ′ 20 ′′ , height of eye 22 feet , the ship having made ...
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.