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Scientific American, Vol. 74, No. 18 (1896) (1896)
leaf 8
chronograph,” which at Green- and it is now arched over. An apparatus has wich is on the other side of the been erected on theeastern turret of the ob- courtyard. servatory for the purpose of enabling the cap- The chronograph is a cylinder on tains of vessels leaving the river to ascertain which… … TAKING AN OBSERVATION. ONE OF THE DOMES, © 1896 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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