A treatise on surveying, comprising the theory and the practice ; (1887)
Gillespie, W. M. (William Mitchell), 1816-1868, Staley, Cady, 1840- [from old catalog] ed · New York, D. Appleton and company · leaf 444
of the reali-ties ; and, if desired, colored appro-priately. Mines may be represented by thesigns of the planets, which were an-ciently associated with the variousmetals. The signs here given rep-resent respectively : Gold. Silver. Iron. Copper. Tin. Lead Quicksilver. A large black circle, ®, may… … Stone bridge.Wooden bridge. Suspension bridge.Aqueduct. Dam. Boat ferry.Eope ferry.Steam ferry. Ford for carriages. Ford for horses. + + + + + + + + + + + + + + + + + + + + 651. Scales. The scale to which a topographical map should bedrawn depends on several considerations. The principal ones…
Surveying
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