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 25
... in length , and in breadth equal to the earth's circumference at the equator . 91. This projection was invented in 1566 by Gerard Mercator ; its object is to represent on a plane the 4 true bearing or course from one place to another as 25.
... in length , and in breadth equal to the earth's circumference at the equator . 91. This projection was invented in 1566 by Gerard Mercator ; its object is to represent on a plane the 4 true bearing or course from one place to another as 25.
Σελίδα 41
... circumference . 163. The circumference may be divided into any number of equal parts . For the purposes of astrono- my , navigation and surveying , geometers divide the cir- cle into 360 equal parts called degrees each degree is ...
... circumference . 163. The circumference may be divided into any number of equal parts . For the purposes of astrono- my , navigation and surveying , geometers divide the cir- cle into 360 equal parts called degrees each degree is ...
Σελίδα 42
... circumference , and is the measure of the angle comprised by two radii , drawn from the centre , one to each extremity of the arc . 167. The COMPLEMENT of an arc , or angle is what the arc or angle wants of a quadrant , or quarter ...
... circumference , and is the measure of the angle comprised by two radii , drawn from the centre , one to each extremity of the arc . 167. The COMPLEMENT of an arc , or angle is what the arc or angle wants of a quadrant , or quarter ...
Σελίδα 45
... circumference of a circle is half the angle at the centre , standing on the same arc ; and it is measured by half the arc it subtends . TRIGONOMETRY . 201. Trigonometry is the application of the proper- ties of the circle to ascertain ...
... circumference of a circle is half the angle at the centre , standing on the same arc ; and it is measured by half the arc it subtends . TRIGONOMETRY . 201. Trigonometry is the application of the proper- ties of the circle to ascertain ...
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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