Text-book on Navigation and Nautical AstronomyLongmans, Green and Company, 1918 - 438 σελίδες |
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Σελίδα 1
... parallel to one another , the primitive is perpendicular to this direction . In the Gnomonic , the eye is supposed to be at the centre of the sphere , and the primitive is a tangent plane to the sphere . In the Stereographic , the eye ...
... parallel to one another , the primitive is perpendicular to this direction . In the Gnomonic , the eye is supposed to be at the centre of the sphere , and the primitive is a tangent plane to the sphere . In the Stereographic , the eye ...
Σελίδα 2
... parallels of latitude as concentric circles whose common centre is the pole . This is useful for showing the course of a rhumb line , also for mapping the circumpolar regions ( Fig . 2 ) . ( b ) Projection on the Plane of the Meridian ...
... parallels of latitude as concentric circles whose common centre is the pole . This is useful for showing the course of a rhumb line , also for mapping the circumpolar regions ( Fig . 2 ) . ( b ) Projection on the Plane of the Meridian ...
Σελίδα 5
... parallel TXL , where the parallel cuts the hour circle is X , the position of the object . Draw ZXA the vertical circle through the object . = Measure WT on the scale of chords for the Amplitude 15 ° , or W. 15 ° N. Measure SA on the ...
... parallel TXL , where the parallel cuts the hour circle is X , the position of the object . Draw ZXA the vertical circle through the object . = Measure WT on the scale of chords for the Amplitude 15 ° , or W. 15 ° N. Measure SA on the ...
Σελίδα 6
... parallel would be 1888 geographical miles from the equator . Again , the meridional parts for 31 ° 1958 , and 1958 1888 70 miles , which would be the length of the expanded degree from 30 ° to 31 ° . = - = The meridional parts for any ...
... parallel would be 1888 geographical miles from the equator . Again , the meridional parts for 31 ° 1958 , and 1958 1888 70 miles , which would be the length of the expanded degree from 30 ° to 31 ° . = - = The meridional parts for any ...
Σελίδα 8
... Parallels of Latitude . - Circles whose planes are parallel to the plane of the Equator . 16. Tropics . - Two parallels of latitude distant 23 ° 28 ' on each side of the Equator : Cancer on the north , and Capricorn on the South . 17 ...
... Parallels of Latitude . - Circles whose planes are parallel to the plane of the Equator . 16. Tropics . - Two parallels of latitude distant 23 ° 28 ' on each side of the Equator : Cancer on the north , and Capricorn on the South . 17 ...
Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
Aldebaran altitude Approx artificial horizon August bearing by compass Bearing of distant blue pole centre chart chron chronometer circle coefficient comp compass bearing compass course correct magnetic bearing cosec course and distance declination deviation Diff distant object fast Find the lat Find the latitude Find true Fomalhaut G.M. noon given Greenwich heeling error height of eye horizontal hour angle inch knots latitude longitude magnetic courses magnetic equator mbars mean meridian Meridian Altitude miles Moon Moon's needle northern hemisphere observed P.M. at ship parallel parallel sailing Pegasi polar distance right angles Right Ascension sailing September set and drift sextant ship's head showed side Sidereal slow Spica standard compass star steering sub-permanent magnetism subtract Sun's Table tons true azimuth true dist variation vertex zenith
Δημοφιλή αποσπάσματα
Σελίδα 373 - Square Measure 144 square inches (sq. in.) = 1 square foot (sq. ft.) 9 square feet = 1 square yard (sq. yd.) 30£ square yards = 1 square rod (sq. rd.) 160 square rods = 1 acre (A.) 640 acres = 1 square mile (sq.
Σελίδα 373 - Measure 12 inches (in.) = 1 foot (ft.) 3 feet = 1 yard (yd.) 5-j yards = 1 rod (rd.) 320 rods =1 mile (mi...
Σελίδα 299 - 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.
Σελίδα 308 - ... 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.
Σελίδα 28 - The angle between the first and last directions of a ray which has suffered two reflections in one plane is equal to twice the inclination of the reflecting surfaces to each other. Let AB be the limb or graduated . arc, of a portion of a circle 60° in extent, but divided into 120 equal parts. On the radius CB let a silvered plane glass D be fixed, at right angles to the plane of the circle, and on the moveable radius CE let another such silvered glass, C, be fixed.
Σελίδα 44 - We have, then, that the sine of an angle is equal to the cosine of its complement, and conversely.
Σελίδα 373 - TABLE. 16 drams, (drs.) make 1 ounce, - marked - oz. 16 ounces ----- 1 pound, ----- lb. 28 pounds - - - , - - 1 quarter, ----- qr. 4 quarters ----- 1 hundred weight, - - cwt. 20 hundred weight - - 1 ton, ------ T.
Σελίδα 297 - Certificate is to answer correctly at least eight of such of the following questions as are marked with a cross by the Examiner. The Examiner will not mark less than 12 : — . I 1.
Σελίδα 308 - Determine the deviation, and name it east or west. 35. If an ordinary standard compass placed higher than the iron top sides be compensated whilst the ship is upright, what coefficient will be affected by heeling ? 36.
Σελίδα 307 - 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.