. Appleton's dictionary of machines, mechanics, engine-work, and engineering. Sand Key, 1851. Brandywine, 1849. Maplin, 1840. Fleetwood, 1889. in form, and consists of two stories. The prevalence of vast fields of ice in the Delaware in winter,rendered it advisable to protect the frame of the tower by surrounding it with a system of thirty 5inch screw-piles, arranged in the form of a hexagon of 75 by 45 feet, the longer axis of the polygonbeing parallel to the thread of the current. This ice-breaker has proved perfectly efficient after a trialof seven winters. The screw-pile lighthouse at Sand
. Appleton's dictionary of machines, mechanics, engine-work, and engineering. Sand Key, 1851. Brandywine, 1849. Maplin, 1840. Fleetwood, 1889. in form, and consists of two stories. The prevalence of vast fields of ice in the Delaware in winter,rendered it advisable to protect the frame of the tower by surrounding it with a system of thirty 5inch screw-piles, arranged in the form of a hexagon of 75 by 45 feet, the longer axis of the polygonbeing parallel to the thread of the current. This ice-breaker has proved perfectly efficient after a trialof seven winters. The screw-pile lighthouse at Sand Key, constructed by I. W. P. Lewis, is different in design and de-tail from all that have preceded it. On reference to the diagram, it will be seen that the base is was found while constructing the Brandywine and Carysfoot lighthouses, that there was a want ofrigidity in the frame-tower, and that the application of any external force produced a vibratory move-ment about the central axis of the frame. Secondly, it was observed that in tying all the horizontalfram
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Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
