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 40
Fig. 21.—Octant. INSTRUMENTS 21 Tobias Mayer in 1767. His idea was that by having acomplete circle, and by repeating the readings in variousparts of the arc and then dividing the total sum by the
Cartography · Surveying
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