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 29
Fig. 8.—The Diopter. surveying was cameo on.The stand was renderedvertical by means of aplumb-line instead of aspirit-level, and stood upon a small tripod. By means ofthe screw arrangements it was possible to turn the sides … Fig. 9.—Ptolemys Rods, or Triquetum.{From BleaiCs Atlas.) both vertically and horizontally. Hero of Alexandria wrotea treatise on the Diopter, and a form of this instrumentwas used by Hipparchus. INSTRUMENTS 11 Fig. 9 represents another interesting and ingenious oldinstrument, known as Ptolemy s…
Cartography · Surveying
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