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 Engraved
Fellowes & Simpson, 1822 - 4 σελίδες
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acute angle arc or angle breadth called centre chord circle circumference co-sine column considered contained corrected course and distance curve line departure diagonal Diagram of Navigation difference of latitude difference of longitude dist east equal equator Example Example.—A ship expanded extremity figure find the COURSE formed give the course give the diff give the distance given greater half Hence hour hypothenuse index set index to meet inspection intersection lati length less Mercator's sailing meridian distance meridional difference middle lat middle latitude miles moon oblique observation parallel plane sailing plane trigonometry points proper difference radius radius be equal ratio reckoning represents right-angled plane triangle Rule Rule.-Set the index secant seen separately set the index ship in lat ship sails side marked equator sine solutions taken tangent tenths tides true tude