Issue 15 and Volume 32.

PUMPS FOR THE RAPID TRANSIT SUBWAY. For a distance of three blocks in Elm street, Manhattan. New York, where the subway tunnel is being built, the excavation is about eleven feet below high water mark, and the water percolates into it at such a rate that three powerful pumps are needed to keep the water out and allow the work of construction to proceed. The pumps are placed at points between Leonard street and Canal street, where there are excavations somewhat below the ordinary subway level. The foreman says it will be necessary to keep the pumps at work after the subway structure has been completed and made watertight, and that there will be three permanent pumping stations at that point in Elm street. The engineers have figured it out that the lifting power of the water soaking into the excavation would lift the entire section of the subway out…

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