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Google This is a digital copy of a book that was preserved for generations on library shelves before it was carefully scanned by Google as part of a project to make the world's books discoverable online. It has survived long enough for the copyright to expire and the book to enter the public domain. Usage guidelines Google is proud to partner with libraries to digitize public domain materials and make them widely accessible. Public domain books belong to the public and we are merely their custodians. its gravity alone, competent to resist; and as the atmo^heric preosura is never removed from its sumnut, whilst the utmost altitude of the jet of vrater which is sometimes thrown over the lantern b short of 100 feel, tie super- abundant atabililj muat be manifest. 19 Breakwaters, duriog yiolent slonns, strongly BUBtains the views taken in this paper, and shows but too dearly, that the masa of stone usually cofflbiiied upon their summits, is deficient in the requisite stability. The comaes of thk celehraled constmclion being dofetailed and jiaggied i Sf Bther, eo •• ^ pifvent movement fatteffe Hy ; as long as its maleriab are proof againal decay, the immotable lawa of giavitalion will retain it in position, and enable it to defy, as it has for eigh^-t^ yean defied, the utaoal force of the Atlanlie storms; unless, indeed, it should be umiaiu A by wavea more thaa 135 fool high, which ia. The form in which the stone ought to be laid and coo Dected to- g Bher, riionld (the writer belieres,) be that of a semi-cylinder, the uis length wise of the work, and the base laid upon stich ao inc Una- tioa Kaward as may counteract sliding, and prevent the possibi Uty of it B o Tertuming upon the harbour angle, for we know that on a lerel plane, one hiilf the amouat offeree will overturn a body which ■ry to li A it.
You can search through the full text of this book on the web at | //books .google .com/I ('fo.. This idea waa not lost upon the a sagadpua Smeaton, wbo^ in erecting the fomaus alone light-honae which succeeded Rndyerd's, built the first thirty feet high from the founds- tioo, so^, and so proportioned the walls and lantern aboye the fundamental aolid that if their maas were reduosd to a cylindrical shape it would add another aoli J column of aboot twenty feet in height; eo that In opposing the action of the sea, the Eddystone Lightrhoose ia equivalent to a aolid column of alone fifty feet in altitude. SO X 7-10, or 135 feet, is the altiluda of the wa^ a^Boee upwanl hydrostatic action this building is, fay.
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In designing this r$iil, I availed myself of the results which have, of late years, been elicited from experiments made in both fjnglai^d and the United States, with a view of determining the strongest form of a cast iron beam.
The surprizing discrepancy between these experiments, and the previously received theories, first awakened i A; me the hope that an eflfective cast rail might be made of.
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