Text-book on Navigation and Nautical AstronomyLongmans, Green and Company, 1918 - 438 σελίδες |
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Σελίδα
... XX . USE OF NAPIER'S DIAGRAM XXI . GREAT CIRCLE SAILING PAGE 1 • 7 33 43 60 8 = 71 93 355 • 97 • 107 • • 117 127 • 139 • 145 • 157 168 · 173 183 195 201 208 216 CHAPTER XXII . LAtitude by DOUBLE ALTITUDES XXIII . FINDING.
... XX . USE OF NAPIER'S DIAGRAM XXI . GREAT CIRCLE SAILING PAGE 1 • 7 33 43 60 8 = 71 93 355 • 97 • 107 • • 117 127 • 139 • 145 • 157 168 · 173 183 195 201 208 216 CHAPTER XXII . LAtitude by DOUBLE ALTITUDES XXIII . FINDING.
Σελίδα 58
... 3. A person on a ship , which is sailing on a straight course observes two lighthouses , one of which , L , is due north of the other , M. When M is due east , L bears 45 ° to the east of 58 TEXT - BOOK ON NAVIGATION .
... 3. A person on a ship , which is sailing on a straight course observes two lighthouses , one of which , L , is due north of the other , M. When M is due east , L bears 45 ° to the east of 58 TEXT - BOOK ON NAVIGATION .
Σελίδα 71
... Sailing . - In parallel sailing , the ship's course is supposed to continue on the same parallel of latitude . There are three things concerned , viz . the Latitude , the Departure or Meridian Distance , and the Difference of Longi ...
... Sailing . - In parallel sailing , the ship's course is supposed to continue on the same parallel of latitude . There are three things concerned , viz . the Latitude , the Departure or Meridian Distance , and the Difference of Longi ...
Σελίδα 72
... sailing , by calling the base departure , the hypotenuse diff . of longitude , and the angle at the base latitude . Then D Dep FIG . 72 . and dep . D. long . D. long . dep . = cos lat . • • • = sec lat . · • ( 2 ) ( 1 ) From ( 1 ) dep ...
... sailing , by calling the base departure , the hypotenuse diff . of longitude , and the angle at the base latitude . Then D Dep FIG . 72 . and dep . D. long . D. long . dep . = cos lat . • • • = sec lat . · • ( 2 ) ( 1 ) From ( 1 ) dep ...
Σελίδα 73
... Sailing . This is a combination of plane and parallel sailing , the dep . being com- mon to both , but the latitude used is the " middle lat . , " or mean of the two latitudes , for in this case the ship does not sail on a parallel of ...
... Sailing . This is a combination of plane and parallel sailing , the dep . being com- mon to both , but the latitude used is the " middle lat . , " or mean of the two latitudes , for in this case the ship does not sail on a parallel of ...
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.