 | G. P. Sanger - 1848 - 752 pages
...to the aqueduct again, through which the water was conveyed until the completion of the bridge. In order to keep the air, which is confined in the closed aqueduct, in communication with the atmosphere, there are 33 ventilators, erected fur this purpose, which are placed at the distance of one mile from... | |
 | 1849 - 388 pages
...to the aqueduct again, through which the water was conveyed until the completion of the bridge. In order to keep the air, which is confined in the closed aqueduct, in communication with the atmosphere, there are 33 ventilators, erected for this, purpose, which are placed at the distance of one mile from... | |
 | 1849 - 388 pages
...to the aqueduct again, through which the water was conveyed until the completion of the bridge. In order to keep the air, which is confined in the closed aqueduct, in communication with the atmosphere, there are 33 ventilators, erected for this, purpose, which are placed at the distance of one mile from... | |
 | 1873 - 1078 pages
...far as it is constructed of masonry ; and only some appurtenances still remain to be mentioned. In order to keep the air which is confined in the closed...in communication with the atmosphere, ventilators, Fig. 90, are erected at distances of every mile; buttresses aa, Fig. 91, are carried up on each side... | |
 | 1849 - 376 pages
...to the aqueduct again, through which the water was conveyed until the completion of the bridge. In order to keep the air, which is confined in the closed aqueduct, in communication with the atmosphere, there are 33 ventilators, erected for this purpose, which are placed at the distance of one mile from... | |
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... of the river, across it, resting on the coffer-dams which were placed round each pier, and up the opposite side to the aqueduct again, through which the water was conveyed until the completion of the bridge. In order to keep the air, which is confined... 