Description and Use of a Diagram of Navigation: By which All Problems in Plane, Traverse, Parallel, Middle Latitude and Mercator's Sailing May be Instantly and Accurately Resolved. Adapted to the Capacity of All who Know the Use of Figures. Designed as an Easy Introduction, by Sensible Demonstration, to the Principles, and the Practice of Navigation. With a Diagram EngravedFellowes & Simpson, 1822 - 4 σελίδες |
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Σελίδα 4
... tenths of a degree , and which , by a vernier scale , may be reduced to minutes , renders it very convenient and accurate in performing many common problems which are somewhat troublesome by the method of inspec- tion , where the tables ...
... tenths of a degree , and which , by a vernier scale , may be reduced to minutes , renders it very convenient and accurate in performing many common problems which are somewhat troublesome by the method of inspec- tion , where the tables ...
Σελίδα 5
... tenths or 37 ° 39 ′ , and the distance 221 miles ; and these results are the same by logarithms . But the mean of two opera- tions by inspection gives the course 37 ° 30 ' , and the distance 220.5 , The Diagram if carefully used is not ...
... tenths or 37 ° 39 ′ , and the distance 221 miles ; and these results are the same by logarithms . But the mean of two opera- tions by inspection gives the course 37 ° 30 ' , and the distance 220.5 , The Diagram if carefully used is not ...
Σελίδα 10
... tenths . 10. The Arc may be divided into any given number of equal parts . 11. On the centre angle of the Diagram is fitted a moveable INDEX ; one edge of which ( that which coin- cides with the pivot on which it moves ) is graduated to ...
... tenths . 10. The Arc may be divided into any given number of equal parts . 11. On the centre angle of the Diagram is fitted a moveable INDEX ; one edge of which ( that which coin- cides with the pivot on which it moves ) is graduated to ...
Σελίδα 11
... tenths of degrees may be subdivided into minutes .. At each end of the main arc is an arc of excess . 17. For permanent use the diagram may be made on hard metal ; but which would be too expensive for general circulation . I therefore ...
... tenths of degrees may be subdivided into minutes .. At each end of the main arc is an arc of excess . 17. For permanent use the diagram may be made on hard metal ; but which would be too expensive for general circulation . I therefore ...
Σελίδα 19
... Thus for 13 take 130 and the subdivisions will be tenths . The operations should always be made as far from the centre angle as may be convenient . 72. The distance between any two meridians contin- ually decreases 19 Parallel Sailing.
... Thus for 13 take 130 and the subdivisions will be tenths . The operations should always be made as far from the centre angle as may be convenient . 72. The distance between any two meridians contin- ually decreases 19 Parallel Sailing.
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Συχνά εμφανιζόμενοι όροι και φράσεις
arc of latitude arc or angle chord circle circumference co-sine co-tangent contiguous angle course 3 points course 3 pts course 38 deg COURSE and DEPARTURE Course and Diff course and distance course sailed curve line departure 84 Diagram of Navigation difference of lati difference of latitude difference of longitude direct course dist DISTANCE and DEPARTURE distance sailed ence of longitude Example Example.-A ship sails find the COURSE find the DISTANCE give the course give the diff give the distance Given both LATITUDES Given-one LATITUDE index remaining index set index to meet meet the difference Mercator's sailing merid meridian distance meridional difference middle lat parallel sailing plane sailing proper diff radius be equal required the course right line drawn right-angled plane triangle Rule Rule.-Set the index secant Set the index ship in lat side as radius side marked equator tance tangent traverse table tude