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 37
of my own which Ibrought out only last year, and which is shown in Fig. 18.The pendulum with the mirror is reversed after each altitudeis taken, and the mean of any pair of readings is taken ascorrect. None of these can give more than approximateresults at sea, and the primary object I had in view… … Fig. 18.—Reeves Artificial Horizon fitted to Sextant. hope, be useful in Polar work, on moving ice, and perhapsalso at sea under favourable conditions. ,; We now come to an epoch-making change inthe construction of instru-ments for navigation, andthat is the introductionof the reflecting mirrorsin…
Cartography · Surveying
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