Text-book on Navigation and Nautical AstronomyLongmans, Green and Company, 1918 - 438 σελίδες |
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Σελίδα 1
... Horizontal . The one used throughout this work is the Horizontal Stereo- graphic Projection , and its important properties are : ( 1 ) all circles on the sphere project into either circles or straight lines ; ( 2 ) any figure on the ...
... Horizontal . The one used throughout this work is the Horizontal Stereo- graphic Projection , and its important properties are : ( 1 ) all circles on the sphere project into either circles or straight lines ; ( 2 ) any figure on the ...
Σελίδα 3
... describe a semicircle . AOB is Rhumbs- 150 120 130 140 Semi Tangents 20 30 40 50 60 70 80 190 100 110 Sines 10 Chords B Tangents 60 FIG . 6 . 10 20 30 40 50 80 70 X a vertical diameter ; OX , a horizontal line through. PROJECTIONS . 3.
... describe a semicircle . AOB is Rhumbs- 150 120 130 140 Semi Tangents 20 30 40 50 60 70 80 190 100 110 Sines 10 Chords B Tangents 60 FIG . 6 . 10 20 30 40 50 80 70 X a vertical diameter ; OX , a horizontal line through. PROJECTIONS . 3.
Σελίδα 4
James Gill Willie Venner Merrifield. a vertical diameter ; OX , a horizontal line through centre ; BY , a tangent at B. OX divides the figure into two quadrants ; the upper one is divided into eight equal parts , and with A as centre and ...
James Gill Willie Venner Merrifield. a vertical diameter ; OX , a horizontal line through centre ; BY , a tangent at B. OX divides the figure into two quadrants ; the upper one is divided into eight equal parts , and with A as centre and ...
Σελίδα 5
... horizontal diameter through Z. Make ZM = 40 ° ( Lat . ) from scale of tangents , and through M draw a line perpendicular to MZ ; in this line are the centres of all hour circles . Make NO = chord of 40 ° ( Lat . ) , where the line OW ...
... horizontal diameter through Z. Make ZM = 40 ° ( Lat . ) from scale of tangents , and through M draw a line perpendicular to MZ ; in this line are the centres of all hour circles . Make NO = chord of 40 ° ( Lat . ) , where the line OW ...
Σελίδα 11
... horizontal reflecting surface used for observing altitudes in the absence of a good sea - horizon . 50. Dip . The angular depression of the Visible horizon below the Sensible , due to the observer's elevated position . 51. Observed ...
... horizontal reflecting surface used for observing altitudes in the absence of a good sea - horizon . 50. Dip . The angular depression of the Visible horizon below the Sensible , due to the observer's elevated position . 51. Observed ...
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.