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 5
... equator will be doub- led on the index - according to the theorem that the secant of 60 ° is equal to twice the radius ; from which is this rule , Rad .: mer . dist . :: sec . of lat .: diff . of lon . In publishing the remarks which ...
... equator will be doub- led on the index - according to the theorem that the secant of 60 ° is equal to twice the radius ; from which is this rule , Rad .: mer . dist . :: sec . of lat .: diff . of lon . In publishing the remarks which ...
Σελίδα 11
... EQUATOR . 21. Either side may be assumed as meridian ; but in practice it will be found most convenient to use one side constantly as meridian , and the other as equator . Throughout this work I shall use the left side as me- ridian ...
... EQUATOR . 21. Either side may be assumed as meridian ; but in practice it will be found most convenient to use one side constantly as meridian , and the other as equator . Throughout this work I shall use the left side as me- ridian ...
Σελίδα 12
... EQUATOR , * in miles . 29. The MERIDIAN DISTANCE on the EQUATOR , in miles . 30. The DIFFERENCE OF LONGITUDE , on the INDEX in miles , for parallel and middle latitude sailing ; but for Mercator's sailing , on the EQUATOR . 31. The ...
... EQUATOR , * in miles . 29. The MERIDIAN DISTANCE on the EQUATOR , in miles . 30. The DIFFERENCE OF LONGITUDE , on the INDEX in miles , for parallel and middle latitude sailing ; but for Mercator's sailing , on the EQUATOR . 31. The ...
Σελίδα 13
... equator , and is counted on a meridian , 90 ° north , to the north pole , and 90 ° south to the south pole . 36. Circles of Latitude are therefore parallel to the equator , and they decrease as the latitude approaches the pole . 37 ...
... equator , and is counted on a meridian , 90 ° north , to the north pole , and 90 ° south to the south pole . 36. Circles of Latitude are therefore parallel to the equator , and they decrease as the latitude approaches the pole . 37 ...
Σελίδα 16
... equator for the departure . Example - A ship sails north 3 points east , 243 miles , required the difference of latitude and de- parture . Here the index set on the course 3 points , 243 the distance taken on the index , intersects the ...
... equator for the departure . Example - A ship sails north 3 points east , 243 miles , required the difference of latitude and de- parture . Here the index set on the course 3 points , 243 the distance taken on the index , intersects the ...
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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