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 96
ansion due to change of temperature, thatit may be considered for all practical purposes to be un-affected by these changes, which greatly simplifies things.The latest base-lines have been measured with tapes or wiresof this metal, and are considered most satisfactory. Fig. 78is a view of one end… … Pig. 78.—Invar Base-Line Apparatus. 78 MAPS AND MAP-MAKING by cords which pass over a pulley and are then connectedwith the invar tape itself. Various arrangements have beendevised for marking the spot on the ground where themeasurements begin and end, but this is generally done nowby aligning with…
Cartography · Surveying
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