Navigation and Nautical Astronomy1861 |
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Page 12
... ship's head is seen at once , and the direction in which the ship is steered is readily noted . The Log - line . The log is a flat piece of thin wood of a quadrantal form , loaded in the circular side with lead sufficient to make it ...
... ship's head is seen at once , and the direction in which the ship is steered is readily noted . The Log - line . The log is a flat piece of thin wood of a quadrantal form , loaded in the circular side with lead sufficient to make it ...
Page 15
... ship with respect to the magnetic meridian , the iron may produce a sensible deflection of the needle ; and this deflec- tion or deviation will in general be the greatest when the ship's head points to the east or west . Various methods ...
... ship with respect to the magnetic meridian , the iron may produce a sensible deflection of the needle ; and this deflec- tion or deviation will in general be the greatest when the ship's head points to the east or west . Various methods ...
Page 16
H. W. Jeans. From this it appears the deviation , when the ship's head is north , is 3 ° easterly . The ship is then ... Ship's Head . Direction of Deviation of Direction of ship's head . compass . ship's head . nearly nearly N. E. 2 ° 45 ...
H. W. Jeans. From this it appears the deviation , when the ship's head is north , is 3 ° easterly . The ship is then ... Ship's Head . Direction of Deviation of Direction of ship's head . compass . ship's head . nearly nearly N. E. 2 ° 45 ...
Page 32
... ( ship's head being S. E. by S. by compass ) , distant 14 miles ; afterwards sailed as by the following log account ; required the latitude and longitude in , on April 28th , at noon . Hours . Knots . Courses . Winds . 1 Lee- Devi- way ...
... ( ship's head being S. E. by S. by compass ) , distant 14 miles ; afterwards sailed as by the following log account ; required the latitude and longitude in , on April 28th , at noon . Hours . Knots . Courses . Winds . 1 Lee- Devi- way ...
Page 34
... ship's head S.E.b.S ... dev . 0 0 true course pts . qrs . 6 2 r . S. • 1 3 r . · ( See table , p . 16. ) 1 3 r . 8 1 r . S. N. dist . 14 ' . or 7 pts . 3 qrs . left of N. , or W. Insert this course and distance in table below . Points ...
... ship's head S.E.b.S ... dev . 0 0 true course pts . qrs . 6 2 r . S. • 1 3 r . · ( See table , p . 16. ) 1 3 r . 8 1 r . S. N. dist . 14 ' . or 7 pts . 3 qrs . left of N. , or W. Insert this course and distance in table below . Points ...
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Common terms and phrases
24 hours altitude for index apparent altitude April 27 ascension mean sun astronomical celestial concave celestial equator chro chronometer showed colatitude compass course course and distance decl deviation diff difference of latitude east ecliptic Elements from Nautical find the latitude Greenwich date Greenwich mean noon haversines heavenly body height of eye horizontal parallax hour angle Index cor index correction July June latitude and longitude mean solar mean time nearly miles moon Moon's declination moon's semidiameter Nautical Almanac observed altitude observed meridian altitude P.M. mean Parallel Sailing pass the meridian point of Aries polar distance pole proportional logarithm refraction required the latitude required the longitude required the true Right asc Right ascension mean sea 20 feet ship mean ship's head sidereal spectator star subtract Sun's declination sun's L. L. sun's lower limb true altitude true bearing true course true distance versine zenith distance