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 10
... ratio to the number assumed . 14. To the main arc of the diagram is annexed an arc of expanded degrees of latitude for the meridional parts used in Mercator's sailing . This arc is also divi- ded into degrees and tenths , and is ...
... ratio to the number assumed . 14. To the main arc of the diagram is annexed an arc of expanded degrees of latitude for the meridional parts used in Mercator's sailing . This arc is also divi- ded into degrees and tenths , and is ...
Σελίδα 12
... ratio and proportion ; by which any three numbers being given a fourth proportional is readily found . Example . - As 220 is to 160 so is 110 to 80. Illustration . — On either side of the diagram take 220 , and trace its line till it ...
... ratio and proportion ; by which any three numbers being given a fourth proportional is readily found . Example . - As 220 is to 160 so is 110 to 80. Illustration . — On either side of the diagram take 220 , and trace its line till it ...
Σελίδα 15
... ratio as she sails more toward the one than the other . 58. If a ship sail more toward the north , or south , than the east or west , the difference of latitude will exceed the departure . 59. And if she sail more toward the east or ...
... ratio as she sails more toward the one than the other . 58. If a ship sail more toward the north , or south , than the east or west , the difference of latitude will exceed the departure . 59. And if she sail more toward the east or ...
Σελίδα 26
... ratio of radius to the cosine of the latitude . 93. In order therefore to represent the true course between two places , the degrees of latitude are also artificially expanded , and in the ratio of the secant of the latitude to radius ...
... ratio of radius to the cosine of the latitude . 93. In order therefore to represent the true course between two places , the degrees of latitude are also artificially expanded , and in the ratio of the secant of the latitude to radius ...
Σελίδα 43
... , its value is there found to be 48 , which is the length or ratio of the sine of 29 deg . to the radius of 100. The other dot- ted straight line which leads from the same point of intersection at the angle 29 deg . and to the 43.
... , its value is there found to be 48 , which is the length or ratio of the sine of 29 deg . to the radius of 100. The other dot- ted straight line which leads from the same point of intersection at the angle 29 deg . and to the 43.
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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