File:Treatise on marine and naval architecture, or, Theory and practice blended in ship building. Illustrated with more than 50 engravings (1852) (14582993448).jpg

Identifier: treatiseonmarine00grif (find matches)
Title: Treatise on marine and naval architecture, or, Theory and practice blended in ship building. Illustrated with more than 50 engravings
Year: 1852 (1850s)
Authors: Griffiths, John W. (John Willis), 1809-1882
Subjects: Naval architecture
Publisher: New York : D. Appleton
Contributing Library: University of California Libraries
Digitizing Sponsor: Internet Archive

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ithout this equili-brium the ocean would be of no ser-vice to man ; vessels might be built, butthey never could be sent to sea, thepreponderating power of the ocean (be-ing the largest bulk) pressing upon everycoast, and upon every river and outlet,would for ever lock every vessel to itsnative shore. Upon this principle a fewounces of water may be made to sup-port any weight, however great. Manystriking phenomena of the materialworld are deduced from this principle.A pipe having an internal surface of 1foot, or an interior circumference of 1foot, or 4 inches diameter, the area ofsuch pipe would be 1 foot, which mul-tiplied by 1 foot, or 12 inches of length,equals 144 square inches. If such pipewere extended 140 feet perpendicular,the lower section, already described,would sustain a bursting pressure of8640 pounds, which is about equal to thatproduced on many high pressure steamboilers. A column of water, the area ofwhose section is one square inch, andof which the height is 27.727, or
Text Appearing After Image:
MARINE AND NAVAL ARCHITECTURE. 21 nearly 28 inches, weighs 1 pound, and28 inches are contained 60 times in 140feet. Hence the lower end of the pipe,1 foot from the base, must sustain thisenormous pressure, because 144 inches,the contents of the foot of pipe, multi-plied by 60, gives 8,640 ; and this pres-sure would remain unchanged, howevermuch the pipe might be altered at thetop, while its perpendicular heightremained ; because, while the altituderemained the same, the weight of acolumn of water of 140 feet in length,1 foot area, is pressing upon the base,and being a frictionless body, must presswith the same weight, even though theupper 139 feet of the pipe be but 1inch in diameter. If a farther illustra-tion were necessary, it might be obtain-ed in witnessing the result of boring ahole in the bottom of a ship when afloat,—we at once see the fluid ascend-ing with a pressure proportionate tothe area of the hole. If the fluid didnot exert a pressure upward as well asdownward, it wou

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