Compressed Air Work And Diving 1909

86 COMPRKSSED AIR WORK. is 2 in. and there are fourteen segments and a key piece to each ring. The cross section of the finished tunnel under the river is shown in Fig. 14D. The paving of the roadway is of compressed asphalt 2 in. thick on this comparatively level portion under the river, but on the approaches, wliich have a gradient of about 1 in 36, Aberdeen setts are used. The roadway is supported on a 9-111. brick arch and the Space between the arch and the cast-iron lining is available for water pipes, electric cables, &c. The cast iron is lined with concrete, and the concrete facecl with white glazed tiles, and the internal diameter when so lined is 27 ft. The contract price for the work was ^1,088,484, which did not, however, include anything for purchase of property. This brought the total up to about >£2,000,000. The contract time was five and a half years, but the time actually taken was only a little over four years. The total length was 6,833 ft- or about 1.3 miles, and of this, 3,741 ft. is tunnel proper, the re- mainder being open approach or cut-and-cover. The tunnel was designed by and carried out under the supervision of Mr Maurice Fitzmaurice, C.M.G., Chief Engineer to the London County Council. The resident engineer was Mr E. H. Tabor. The con- tractors were Messrs Price & Reeves and they were represented on the works by Mr J. H. Price and Mr James Brown.