Maps and map-making; three lectures delivered under the auspices of the Royal geographical society (1910)
Reeves, Edward Ayearst, 1862-1945, Royal Geographical Society (Great Britain) · London, The Royal geographical society · leaf 52
ance the per-centage of the rightangle direction line indi-cated by the telescope tothe initial direction. Thispercentage division iseffected on the principleof the tangent of 45° being equal to radius. Eachof the eight tangents is divided into 100 equal spaces, andlines are drawn from these spaces… … Fig-. 40.—Transit Theodolite used on IndianSurvey. 34 MAPS AND MAP-MAKING this theodolite is fitted with the ordinary ones, for readingthe arc in the usual manner.
Cartography · Surveying
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