The Rondout Syphon.
The Rondout syphon, of the new supply system for New York was inspected by Mayor McClellan, accompanied by John A. Bensel, president of the water hoard and J. Waldo Smith, chief engineer of the works. The syphon tunnel is 14 1/2 feet inside diameter, and the aqueduct at each end is 17 feet high. This work was begun June 16, 1908, and was to be completed within fifty-four months. Already 60 per cent, of the length of the syphon or pressure tunnel has been driven, the entire length projected being 23,600 feet. Seven of the eight shafts from which the tunnel is being driven have been completed, and their headings turned. The one remaining shaft. No. 4, has not yet reached bottom on account of difficulty with water which was first encountered in the early spring. Large pumps have been installed at this shaft, the flow of water, which at times has amounted to as much as 750 gallons per minute, has been controlled, and the work of sinking the shaft is once more in progress. It is expected that by February next practically all of the tunnel except that in the immediate vicinity of shaft No. 4 will have been driven. The lining will shortly thereafter begin, and the entire work should be accomplished by the end of 1910. The deepest shaft, No. 8. has been driven 800 feet below the surface. Bonticou tunnel, which is also included under this contract, and which trends southerly from Rondout valley under Bonticou mountain, was completed to a point under the mountain, a distance of about 3,300 feet, several weeks ago. Work is now proceeding day and night, the laborers working eight hours a day itt shifts. In all about 1,800 men are employed by the company.