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Scientific American, Vol. 29, No. 20 (November 1873) (1873)

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An illustration from Scientific American, Vol. 29, No. 20 (November 1873), 1873, leaf 0
cles of the metal change their arrangement Hitherto the ventilation has been perfectly effi- without altering the external form. Hence it is cient, and no danger is apprehended from the use of naked lights or from the gas jets by which necessary to preserve wire, such as is used in the the subways… … SECTION OF LONDON SUBWAY—SOUTH SIDE AT WEST END OF VIADUCT. M'~ SECTION OF LONDON SUBWAY—NOETH SIDE. JUNCTION OF OHAETEBHOU8E STEEET. © 1873 SCIENTIFIC AMERICAN, INC

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