Hinks, Arthur R. (Arthur Robert), 1873-1945 · Cambridge, University press · leaf 190
sance ladder incourse of erection. 3. Double tripod scaffold fortheodolite and observer. fieconnaissance ladder and beacon.Service Geographique de VArniee. Designed by Commandant L. Ditrand,11 Rcpinient dAriillerie. TOPOGRAPHICAL SURVEY 137 a chain should start from one base and close on another.… … Fig. 18. Diagram of Geodetic Triangulation up the Nile Valley from Cairoto Beba. The two heavy lines are bases. Beacons. Beacons are of two principal kinds : the luminous and theopaque. In most countries, when the ray is more than eight ornine miles long it is necessary to use luminous beacons or…
Maps · Surveying
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