. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 1842.] THE CIVIL ENGINEER AND ARCHITECTS JOURNAL. 191 the breakwater, which, although squared and dovetailed into the structure, and embedded in excellent cement to the extent of their â¢whole depth, and thus forming a solid mass, were torn from their positions, and projected over the breakwater into the Sound. " Mr. Walker attributed this to the hydrostatic pressure exerted beneath the stones, at the moment when the atmospheric pressure above had been disturbed by the m
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 1842.] THE CIVIL ENGINEER AND ARCHITECTS JOURNAL. 191 the breakwater, which, although squared and dovetailed into the structure, and embedded in excellent cement to the extent of their â¢whole depth, and thus forming a solid mass, were torn from their positions, and projected over the breakwater into the Sound. " Mr. Walker attributed this to the hydrostatic pressure exerted beneath the stones, at the moment when the atmospheric pressure above had been disturbed by the masses of water suddenly and rapidly thrown upon the surface of the breakwater; blocks of stone were thus often carried to a great distance, not so much by the waves lifting them as by the vacuum created above by the motion of the water, â which exerted at the same time its full pressure from ; And as additional evidence that the formation of a partial vacuum is sometimes a consequence of the envelopment of sea works by high â¢waves, Mr. Walker further stated, " that during a storm in the year 1S40, the sea door of the Eddystone Light-house was forced out- wards, and its strong iron bolts and hinges broken by the atmospheric pressure from within. In this instance ne conceivecl that the sweep of the vast bodv of water in motion round the light-house had created a partial and momentary, though effectual vacuum, and thus enabled the atmospheric pressure within the building to act upon the only yielding part of the ; As both the above remarkable instances came professionally under the notice of Mr. M'alker, we are bound to place the utmost reliance â upon the inferences derivaljle from his statements; and they indicate conclusively that no lateral connexion by dovetails, or otherwise, will compensate for a want of depth of sohd stone; but that we must rely for stability in the coping of sea works, chiefly upon the weight of a large mass of materi
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