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n. — Discussion of Tidal Observations made by direction of the Royal Irish Aca- 

 demy in 1850-51. By the Rev. Samuel Haughton, M. A., Fellow of Tri- 

 nity College^ and Professor of Geology in the University of Dublin. 



Bead April 24th, 1854. 



PART FIRST. 

 THE SOLAR AND LUNAR DIURNAL TIDES ON THE COASTS OF IRELAND. 



IN the autumn of 1850 tidal observations were commenced at twelve stations 

 on the coasts of Ireland, under the direction of the Committee of Science of 

 the Royal Irish Academy. One of these stations, Kilrush, county of Clare, was 

 abandoned shortly after the commencement of the observations, in consequence 

 of difficulties experienced in obtaining a sufficiently sheltered position for the 

 tide-gauge ; and at another station, Killybegs, county of Donegal, the observations 

 made were not of so complete a character as at tlie I'emaining ten stations. 



At the request of the Committee of Science, I undertook the task of re- 

 ducing and discussing the tidal observations, the reduction of the meteorological 

 observations being undertaken by tlie Rev. Humphrey Lloyd, whose Notes on 

 the Meteorology of Ireland, deduced from those observations, have been re- 

 cently published by the Academy. 



The tidal observations made under the direction of the Academy were of 

 two distinct kinds :— the first being the observation of all the High and Low 

 Waters at each often stations, for periods varying from sixteen to twelve 

 months ; the second being the observation of complete tides, at intervals of 

 fifteen minutes, the tides selected for this purpose being four in each lunation, 

 two spring and two neap. These observations were made at eleven stations, 

 and, like the former, extend over a period varying from sixteen to twelve 

 months. 



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