Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 493
e, the screw is inserted inti.the reef 4 or 5 feet deep. A long signal pole, with a cone or ball on top, is then inserted in the irontube, and will stand erect during the heaviest storms. The number of wTecks on these reefs has greatlydininished since the operations of the Coast Smvey were… … PILE, SCREW, AND SCREW-MOOKING. 487 put down with the intention of placing Ilnjhthouses on their sites, should they appear eventually to snftcfno change by the action of the sea. All these beacons are similar in form and principle (fin;. 3068)each consisting of a single pile of wrought-iron in two…
Mechanical engineering · Mechanics · Engineering
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