The Falls of Niagara and Their Retrograde Movement PDF ePub eBook

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The Falls of Niagara and Their Retrograde Movement free pdf Excerpt from The Falls of Niagara and Their Retrograde Movement February, Thus Bakewell, a naturalist otherwise reliable, estimates the retrograile moveuieut at tliree feet in a year. Iyell, who visited the United States some twenty years later, could not avoid discussinof so popular a question. He has accordingly replied in detail and acknowledged that the movement declared by Mr. Bakewell was too great- in place of three feet a year, he fixes it at one- or as the falls are at present distant seven miles(3.3, 000 feet) from the cliffs at Lewistown, it follows by his calculation that 35, 000 years have passed since the river commenced to notch the cliffs there. But in truth this result does not rest on any more certain basis than that of Bakewell, it only differs from the latter in being more moderate. It is true the author does not urge the opinion as reliable, but those who have copied it often neglect to add this explanation, and so this term of 35, 000 years, which is at best but an approximation, has passed erroneously into the manuals of (Jeology and Physics for what it is not a deduction from scientific inquries and facts. We have been furnished with the first certain data for an exact determination of the periodical retrogradation of the Niagara Falls from an abstract on the Geology of the State of New York. A commission composed of engineers made, under the direction of Mr Jauies Hall the celebrated Paleontologist of Albany, a trigonometrical survey of the Falls and its environs. The chart constructed from their materials represents the outline of both Falls on a scale sufficiently large to render it easy to mark any change that may happen in the future, and consequently the periodical retrocession. If the Falls recede as rapidly as has been supposed (three or one foot annually) nothing will be simpler than to ascertain it at once, since twelve years have elapsed from the date of the chart, and the latter is, beyond all question, sufficiently exact to exhibit by comparison every notable or appreciable displacement on any point. Unfortunately there is no probability that the present generation will have this experience. In spite of the partial degradings which happen in a dozen years, it is found difficult, by means of the most careful and exact measurements, to detect anjsensible alteration in the position or outline of either fall. It is not to be said, however, that a palpable change may not occur in the future undoubtedly our successors will have the great advantage over us, in being able to go, instruments in hand, to assure themselves of the extent to which in a given time the cataract has degraded its barrier- at least with these data tor reference and comparing them with existing facts, such as the accumulations of detritus, the formation of the channel, c., c., they will be able to devote themselves with more safety than we, to speculate on the relative inHuencc of the different agents that contribute slowly to modify the surface of our globe- and jioihaps it may fall to their lot also, in determining scientifically the age of the Falls of Niagara, to free (ieology once for all from the fictitious elements engrafted by strange hands, and which, though originating in honest motives, are not the less prejudicial to the true progress of our beautiful science. And yet we also may derive useful information from the chart: ray object in this communication is to show, that tin- form and outline of the Falls, as represented therein, constitute an important element of the (uestion, which will assist now, I hope, to rectify the extreme and loose opinions prevalent as to their annual retrocession. To render my reasoning better understood, I have hereto ap)ended a copy of Mr. Halls map. The two Falls dilfer in outline and force. The Canadian, which is of much the greater volume, is cxcavateil in the middle, where the destructive action of the water appears to have been far stronger than at its sides, thence its na.

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Details Book

Author : E Desor
Publisher : Forgotten Books
Data Published : 27 September 2015
ISBN : 1330642201
EAN : 9781330642207
Format Book : PDF, Epub, DOCx, TXT
Number of Pages : 26 pages
Age + : 15 years
Language : English
Rating :

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  • The Falls of Niagara and Their Retrograde Movement free pdfThe Falls of Niagara and Their Retrograde Movement

    . Excerpt from The Falls of Niagara and Their Retrograde Movement February, Thus Bakewell, a naturalist otherwise reliable, estimates the retrograile moveuieut at tliree feet in a year. Iyell, who vis