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 48
oor three seconds, with care. As already stated, the Diopter of the ancient Greeksseems to have contained the first suggestion of the theodolite, INSTRUMENTS 29 but how far there was any sort of resemblance it isimpossible to say now. If we imagine the diopter fittedwith circles there would… … Pig. 35.—Digges Theodolite. whose invention is described in his book on surveying.This work was completed by his son, Thomas Digges, andpublished in 1571. Digges constructed his theodolite there-fore a few years before this date. The name theodolite,of which the origin is uncertain, although…
Cartography · Surveying
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