. Bulletin - United States National Museum. Science. hames 11 \m i in use by London Underground railway. (Illustrated London News, 1869?). 1 igure ag l'i \< wc v segment of cast-iron lining in * rreathi Tower Subway, 1869. to the rear is the shield's diaphragm or hulk- head. MHT modelâ; scale. 1 Smithsonian photo ao.'ho B.) Bl VUI s HROADW VI SUBW \"i Almost simultaneously with the construction ol the Tower Subway, the first American shield tunnel was driven by Allied I I. Bi a< h I ' â 1 Bi a. h. as editor of the Scientific American and inventor of, aj il; other things, a
. Bulletin - United States National Museum. Science. hames 11 \m i in use by London Underground railway. (Illustrated London News, 1869?). 1 igure ag l'i \< wc v segment of cast-iron lining in * rreathi Tower Subway, 1869. to the rear is the shield's diaphragm or hulk- head. MHT modelâ; scale. 1 Smithsonian photo ao.'ho B.) Bl VUI s HROADW VI SUBW \"i Almost simultaneously with the construction ol the Tower Subway, the first American shield tunnel was driven by Allied I I. Bi a< h I ' â 1 Bi a. h. as editor of the Scientific American and inventor of, aj il; other things, a successful typewriter as early as 1856, was well known and respe< ted in technical I lie was not a civil engineer, but had become con- cerned with New York's pressing traffii problem 1 even then) and as a solution, developed plans for a rapid-transit siiliwuv to extend the length ol Broadway. He invented a shield as an adjunct to this system, solely 10 permit driving of the tunnel without dis- turbing the overly ing streets. An active patent attorney as well. Beach must certainly have known ol' and studied the existing patents for tunneling shields, which were, without exception, British. In certain aspects his shield resembled the one patented by Barlow in 1864, hut never built. However, work on the Beach tunnel started in 1869, so close in time to that on the Tower PAPER 41: TUNNEL ENGINEERING \ MUSEUM TREATMENT 227. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
