Newton's Guide to the Board of trade examinations of masters and mates of sailing ships and steam ships, in navigation and nautical astronomyJ. Newton, 1884 - 176 páginas |
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Página 4
... index at error of How do you make the third adjustment ? In the absence of a screw , how would you proceed ? How would you find the index error by the horizon ? How is it applied ? clamp it , and leave it . minutes to be added , Note ...
... index at error of How do you make the third adjustment ? In the absence of a screw , how would you proceed ? How would you find the index error by the horizon ? How is it applied ? clamp it , and leave it . minutes to be added , Note ...
Página 5
... index error by the sun ? 13 . The readings being { } what is the index error , and how do you apply it ? 14. What proof have you that those measurements or angles have been taken with tolerable accuracy ? ANSWERS TO THE FOREGOING ...
... index error by the sun ? 13 . The readings being { } what is the index error , and how do you apply it ? 14. What proof have you that those measurements or angles have been taken with tolerable accuracy ? ANSWERS TO THE FOREGOING ...
Página 6
... index error . Set the index near o , hold the sextant vertically , and look through the telescope and the horizon glass at the horizon ; if the true and reflected parts of the horizon are not in the same straight line , move the tangent ...
... index error . Set the index near o , hold the sextant vertically , and look through the telescope and the horizon glass at the horizon ; if the true and reflected parts of the horizon are not in the same straight line , move the tangent ...
Página 31
... INDEX ERROR . - If + add , if — subtract . - DIP . - Table V. , always subtract . REFRACTION . - Table IV . , always subtract . SEMIDIAMETER . - Nautical Almanac , Page II . , for Greenwich day , if Lower limb , add ; if Upper limb ...
... INDEX ERROR . - If + add , if — subtract . - DIP . - Table V. , always subtract . REFRACTION . - Table IV . , always subtract . SEMIDIAMETER . - Nautical Almanac , Page II . , for Greenwich day , if Lower limb , add ; if Upper limb ...
Página 32
... Index error 50 " to add . Height of eye 20 feet . Required the Latitude . ( Declination corrected by Proportional Logs . ) d . 1885 , Sept. 22 Long G.A.T. Long . 169 ° 30 ′ W. Obs . alt ... 40 ° ' 20 " 4 I.E ... + 50 6,0 ) 67,8 0 40 2 ...
... Index error 50 " to add . Height of eye 20 feet . Required the Latitude . ( Declination corrected by Proportional Logs . ) d . 1885 , Sept. 22 Long G.A.T. Long . 169 ° 30 ′ W. Obs . alt ... 40 ° ' 20 " 4 I.E ... + 50 6,0 ) 67,8 0 40 2 ...
Términos y frases comunes
ADDITIONAL FOR MASTER Altitude was taken Azimuth and Error Ballycastle Bay Bearing of distant bore by compass Chronometer showed common logarithms Comp Compass bearings compass course correct mag correct magnetic bearing correct magnetic courses course and distance course to steer current set Dist distant object eye 19 feet eye 20 feet Find the course Find the ship's following courses Greenwich Mean height of eye Index Error line of position Long Longitude by Chronometer MATE mean noon miles per hour noon at Greenwich object by Standard observed altitude observed meridian altitude parallel sailing required the deviation Required the Latitude Required the true second Altitude sextant ship being supposed ship in lat Ship's Head Bearing ship's position Standard Compass Standard object steer by compass steered the following subt subtract Sumner's Method sun's bearing Sun's L. L. sun's lower limb supposing the variation thence the deviation true amplitude true azimuth ΙΟ
Pasajes populares
Página 76 - In the following table give the correct magnetic bearing of the distant object, and thence the deviation. 8. With the deviation as above, give the courses you would steer by the Standard Compass to make the following courses, correct magnetic : — . . 9.
Página 7 - Having determined the deviation with the ship's head on the various points of the compass, how do you know when it is easterly and when westerly ? 4.
Página 146 - 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.
Página 138 - Ship's Head by Standard Compass. Bearing of distant object by Standard Compass. Deviation required. Ship's Head by Standard Compass.
Página 8 - Compasses of iron ships are more or less affected by what is termed the heeling error ; on what courses does this error vanish, and on what courses is it the greatest ? 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. The effect being as you state, on what courses would...
Página 13 - ... are the usual indications of a ship being on the line of progression of the centre of a Cyclone ? 5. What are the usual indications that a ship is (a) approaching the centre of a Cyclone ; fb) receding from it?
Página 8 - Q. 15. The compasses of iron ships are more or less affected by what is termed the heeling error. On what courses does this error vanish, and on what courses is it the greatest ? A.
Página 9 - 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.
Página 147 - Tenby, by reckoning took a cast of the lead. Required the correction to be applied to the depth obtained by the lead line before comparing it with the depth marked on the Chart.
Página 13 - And suppose that the wind during the passage of the same cyclone were found to change toward the* , what would be the ship's position with reference to the line of progression of the centre of the cyclone, and what action would you take ? 8.