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 45
... declination by the same method as used in the meridian altitude , taking care to take the declination from page II . of the Nautical Almanac . Lat . Dec. Same name , subtract dec . from 90 ° . Lat . Dec. Diff . names , add 90 ° to dec ...
... declination by the same method as used in the meridian altitude , taking care to take the declination from page II . of the Nautical Almanac . Lat . Dec. Same name , subtract dec . from 90 ° . Lat . Dec. Diff . names , add 90 ° to dec ...
Página 46
... declination instead . Add the above four logs . together , cast off the tens from the index , and seek the sum of the logs . in Table XXXI . , which gives the hour angle , or time from nearest noon . Question . Is it A.M. or P.M. at ...
... declination instead . Add the above four logs . together , cast off the tens from the index , and seek the sum of the logs . in Table XXXI . , which gives the hour angle , or time from nearest noon . Question . Is it A.M. or P.M. at ...
Página 50
... Declination and Polar Distance as in " Lon- gitude by Chronometer . " 2. If the mean time at Greenwich is given . Find the Declination and the Polar Distance , also the Equation of time exactly as in " Longitude by Chrono- meter ...
... Declination and Polar Distance as in " Lon- gitude by Chronometer . " 2. If the mean time at Greenwich is given . Find the Declination and the Polar Distance , also the Equation of time exactly as in " Longitude by Chrono- meter ...
Página 52
... declination are of the same or of contrary names . Then with the apparent time at ship at the side , and declination on the top take out the true azimuth . TO NAME THE TRUE AZIMUTH . - To be named the same name as the latitude ; towards ...
... declination are of the same or of contrary names . Then with the apparent time at ship at the side , and declination on the top take out the true azimuth . TO NAME THE TRUE AZIMUTH . - To be named the same name as the latitude ; towards ...
Página 53
... Declination , and with 8h 2m Apparent Time at Ship at the side , and 14 ° 2 ′ Declination on top , take out 124 ° 10 ' . True Azimuth . S. 124 ° 10 E. - True Azimuth Take from .... True Azimuth Observed Azimuth . Error of Compass ...
... Declination , and with 8h 2m Apparent Time at Ship at the side , and 14 ° 2 ′ Declination on top , take out 124 ° 10 ' . True Azimuth . S. 124 ° 10 E. - True Azimuth Take from .... True Azimuth Observed Azimuth . Error of Compass ...
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.