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 109
local mean time, thedifference giving him the longitude east or west of Greenwich.On land, it is not at all easy to carry the time, on account ofthe difficulty of transporting chronometers without the ratevarying with jolting and change of positions, so now all weusually attempt to do by this… … Fig. 91.—Observing with Sextant and Artificial Horizon. will soon come to our aid in finding longitude, but so far ithas always been a troublesome business, on land especially.In reckoning longitude, we might start from the meridianof any place, and in fact all sorts of initial meridians havebeen…
Cartography · Surveying
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