Excerpt from Notes on Mitering Lock Gates
Locks, as applied in canals and harbors, are used to permit the safe passage of vessels from one water level to another. The separation of the levels is secured by means of movable barriers, called gates.
It is not the object of the present treaties to discuss the construction of the complete lock, but of the gates alone, which, while forming but a small item in the cost of the whole structure, are nevertheless its most vital parts.
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PAP. Zustand: New. New Book. Shipped from UK. Established seller since 2000. Artikel-Nr. LW-9780282626754
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