The theory and practice of surveying. Designed for the use of surveyors and engineers generally, but especially for the use of students in engineering (1886)
Johnson, J. B. (John Butler), 1850-1902 · New York, J. Wiley & sons · leaf 603
the table in project-ing a map by the polyconic method.The map covers 30 degrees in lati-tude (30° to 60°) and 60 degrees inlongitude. The straight line 0^0^ isfirst drawn through the centre of the map, and graduated ac-cording to the lengths of one degree of latitude, as given inthe second column… … Mj, m^, etc., This ta-ble gives the meridian distances when 11 is less than one degree,as well as when n is greater. From the points m^, m^, etc.,the divergence of the parallels is laid off above the lines Oin,by the aid of the second portion of Table XL, thus obtainingthe positions of the…
Surveying
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