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 44
n, and the limb bearing the quadrant wascovered with copper. It is interesting to note that we havehere at this date the firstintroduction of the tele-scope, with spider lines inthe diaphragm, attachedto angular measuring in-struments, for although itwas invented over sixty-years before this… … Fig. 30.—Diagonal Scale for increasingaccuracy of reading Angles. you see on the instrument in Fig. 30, and which must havebeen of considerable assist-ance in determining the smalldivisions. However, evenwith this, things were veryunsatisfactory, and inventiveminds were strenuously en-deavouring to…
Cartography · Surveying
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