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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 45

An illustration from Maps and map-making; three lectures delivered under the auspices of the Royal geographical society, 1910, leaf 45 — etter addressed to Tycho Brahe, in 1590, by oneJacque Curtius, is perhaps to be found the suggestion ofthe Vernier (Fig. 32); but however that may be, FrancisVernier was the first to work out this most ingenious andsimple arrangement, and bring it into practical use, whichhe did in 1630. The… … Fig. 32.—Vernier of Sextant. INSTBU3IEXTS •27 number of degrees of the principal arc has been marked off,into a slightly different number of divisions to that occupiedby the same space in the arc itself; then, by noticing wherethe line on the arc coincides with a line on the small arc, orvernier,…

Cartography · Surveying

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