Text-book on Navigation and Nautical AstronomyLongmans, Green and Company, 1918 - 438 σελίδες |
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Σελίδα 1
... 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 is on the circumference of the sphere , and the primitive is a ...
... 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 is on the circumference of the sphere , and the primitive is a ...
Σελίδα 14
... directions of compass north . TM , Variation ( west ) . MC , Deviation ( east ) . MC ,. 99 TC , Error of compass ( east ) . TC1 , ( west ) . ( west ) . 99 CD'or C , D , Compass course from north . TD , True course from north . MD ...
... directions of compass north . TM , Variation ( west ) . MC , Deviation ( east ) . MC ,. 99 TC , Error of compass ( east ) . TC1 , ( west ) . ( west ) . 99 CD'or C , D , Compass course from north . TD , True course from north . MD ...
Σελίδα 17
... direction for the purpose of compensating the compasses . The sight - vanes being clamped to a known correct magnetic bearing , and the card turned round until the desired direction of ship's head is at the lubber - point , then the ...
... direction for the purpose of compensating the compasses . The sight - vanes being clamped to a known correct magnetic bearing , and the card turned round until the desired direction of ship's head is at the lubber - point , then the ...
Σελίδα 28
... directions of a ray which has suffered two reflections in one plane is equal to twice the inclination of the re- flecting surfaces to one another . " Let I and H repre- sent the index and hori- zon glasses of a sextant . Light from S ...
... directions of a ray which has suffered two reflections in one plane is equal to twice the inclination of the re- flecting surfaces to one another . " Let I and H repre- sent the index and hori- zon glasses of a sextant . Light from S ...
Σελίδα 29
... direction Er , and if r were the horizon , the object's image would be seen on the horizon . IO represents the index bar when the mirrors are parallel , and IP when it has been moved to P. Produce PI to a , PH to b , and EH to r . HIP ...
... direction Er , and if r were the horizon , the object's image would be seen on the horizon . IO represents the index bar when the mirrors are parallel , and IP when it has been moved to P. Produce PI to a , PH to b , and EH to r . HIP ...
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.