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20 feet action Admiralty Atlantic atmospheric pressure average barometer Bay of Fundy Beaufort scale Bell Dawson blowing bore Bristol Channel British Association calculated cause centre coast crest cyclone declination depressed depth of water difference direction distance disturbance diurnal earth ebb current English Channel equator Equilibrium theory estuary feet high float flood tide foot force gale given gravity greater harbour height high water Humber inches increased interval Islands lake length Liverpool London low water maximum mean level miles an hour minutes moon moon's motion mouth movement moving neap tides North Sea occurred orbit Ordnance Datum oscillation particles of water perigee period Portishead ports range rate of propagation reach recorded result rise and fall round salt secondary undulations shoal shore Southern Ocean spring tides storm sun and moon surface Thames tidal current tidal river tidal wave tide gauge tide tables tides rise trough variation varying velocity vessel
Seite 5 - Newton, who came to the conclusion that every particle of matter attracts every other particle with a force proportional to the product of their masses, and inversely proportional to the square of their distances.
Seite 91 - ... in that affair, with confidence maintain it stood a quiet, still, dead water a full hour and a half, without moving or returning in any way never so little ; yea, the watermen flung in...
Seite 11 - Therefore the greatest tides fall out in those syzygies, and the least in those quadratures, which happen about the time of both equinoxes: and the greatest tide in the syzygies is always succeeded by the least tide in the quadratures, as we find by experience. But, because the sun is less distant from the earth in winter than in summer, it comes to pass that the greatest and least tides more frequently appear before than after the vernal...
Seite 92 - In this posture stood the water a whole hour and a half, or rather above, by the testimony of above 500 watermen on either side of the Thames, whom not to believe in this case were stupidity, not discretion. At last, when all men expected its ebb, being filled with amazement that it stood so long as hath been delivered, behold a greater wonder — a new tide comes in ! A new tide with a witness. You might easily take notice of him ; so loud he roared that the noise was guessed to be about Greenwich,...
Seite 92 - ... on the shore moved as much, except when they moved their oars ; nay — a thing worthy the admiration of all men — they rowed under the very arches, took up their oars, and slept there, or, at least, lay still an hour very near ; their boats not so much as moved through any way, either upward or downward, the water seeming as plain, quiet, even, and stable as a pavement under the arch, where, if anywhere in the Thames, there must be moving, by reason of the narrowness of the place.
Seite 14 - Yet, strange as it may appear, this theory has been of very great use. It has served to show that there are forces in nature following laws which bear a not very distant relation to some of the most conspicuous phenomena of the tides ; and, what is far more important, it has given an algebraic form to its own results, divided into separate parts...
Seite 10 - The two luminaries excite two motions, which will not appear distinctly, but between them will arise one mixed motion compounded out of both. In the conjunction or opposition of the luminaries their forces will be conjoined, and bring on the greatest flood and ebb. In the quadratures the sun will raise the waters which the moon depresses, and depress the waters which the moon raises, and from the difference of their forces the smallest of all tides will follow. And because (as experience tells us)...