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 67
... Diff . , stands tab . diff . 153 ; which multiplied by 4 , the remaining digit of the given number , produces 612 ; then cutting off one digit from this ( since we have multiplied by only one digit ) it becomes 61 , which being added to ...
... Diff . , stands tab . diff . 153 ; which multiplied by 4 , the remaining digit of the given number , produces 612 ; then cutting off one digit from this ( since we have multiplied by only one digit ) it becomes 61 , which being added to ...
Página 71
... diff . 124 ) * 7700 ( '62 744 260 248 Attaching this ( '62 ) to the four figures , we have 349162 , & c . The decimal punctuation or local value of the figures of the number can now be adjusted , and as the index is 3 , we obtain , by ...
... diff . 124 ) * 7700 ( '62 744 260 248 Attaching this ( '62 ) to the four figures , we have 349162 , & c . The decimal punctuation or local value of the figures of the number can now be adjusted , and as the index is 3 , we obtain , by ...
Página 77
... diff . 52 8307919444 Tab . diff . 75 X 16 Log . Diff . for 72+ 37 450 75 919481 12,00 579416 log . 5.762990 4324 log . 3.635886 X 72 104 364 37,44 1340 log . 2.127104 4. Divide 34 by 582 . 34 log . 1531479 582 log . 2.764923 Quotient ...
... diff . 52 8307919444 Tab . diff . 75 X 16 Log . Diff . for 72+ 37 450 75 919481 12,00 579416 log . 5.762990 4324 log . 3.635886 X 72 104 364 37,44 1340 log . 2.127104 4. Divide 34 by 582 . 34 log . 1531479 582 log . 2.764923 Quotient ...
Página 78
... Diff . for 1879 = 273927 Diff . 232 2 = + 46 2 Log . 2684 428782 * Tab . diff . 162 Diff . for 3 + .49 X 3 Log . 187921 * 273973 46,4 Log . 26843 = 428831 48,6 or 49 Log . 18.7921273973 26843 log . 4'428831 Log . 000783 = 6 · 893762 ...
... Diff . for 1879 = 273927 Diff . 232 2 = + 46 2 Log . 2684 428782 * Tab . diff . 162 Diff . for 3 + .49 X 3 Log . 187921 * 273973 46,4 Log . 26843 = 428831 48,6 or 49 Log . 18.7921273973 26843 log . 4'428831 Log . 000783 = 6 · 893762 ...
Página 79
... Diff . for 2 = + 32 Diff . 158 X 2 Log . 2747438891 31,6 Log . 02747 8.438891 Log . 34340535800 Log . 008000 = 7'90309 ! Or , using negative characteristics , thus : - Log . 027472438891 Log . 3'4340 * 535800 Log . * 008 = 3.903091 ...
... Diff . for 2 = + 32 Diff . 158 X 2 Log . 2747438891 31,6 Log . 02747 8.438891 Log . 34340535800 Log . 008000 = 7'90309 ! Or , using negative characteristics , thus : - Log . 027472438891 Log . 3'4340 * 535800 Log . * 008 = 3.903091 ...
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.