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 sider
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arc or angle breadth called centre chord circle circumference co-sine column considered contained corrected course and distance curve line departure diff lat diff lon diff of lat difference of latitude difference of longitude dist equal equator Example.—Given expanded extension extremity ference figure find the course formed give the course give the diff give the distance given greater half Hence hour index remaining index set index to meet inspection intersection lati length less meridian distance middle lat middle latitude miles moon oblique observation opposite places plane sailing points proper diff quarter radius radius be equal ratio reckoning represents required the course right-angled plane triangle Rule.—Set the index rules secant set the index ship in lat side marked equator sine solutions taken tance tangent tenths tides traverse true tude