Journal of the Association of Engineering Societies (1881)
Association of Engineering Societies (U.S.) · New York, [etc.] Board of Managers · leaf 312
296 ASSOCIATION OF ENGINEERING SOCIETIES. tower location was covered with sand from 2 to 6 ft. deep, holes could not be drilled for the east side anchors, so three 6x6-ft. con- crete blocks were used for each anchor. For drilling the holes a platform was built upon a 22-ft. section of 12-in. pipe,… … 6. Drilling- Holes in River Bottom. tripod was placed on the plank platform. The drill was operated by steam obtained through a steam hose from the boiler on the derrick boat. The drill which was 24 ft. long was let down through the pipe, the hole drilled and the drill moved away. After that the…
Engineering
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