38 The Rev. Samuel Haughton on the Solar and Lunar 



X. Kingstown, county of Dublin. Lat. 53° 17' N. ; Long. 6° 8' W.— The 

 gauge was placed in the inner angle of the new harbour, and was well sheltered 

 from all points, particularly the north-east, from which direction large waves 

 often enter Kingstown Harbour. 



Its zero was referred to the copper bolt in the coping-stone of the pier near 

 the water tank, and found to be 18-28 feet below this bolt. 



XL CouETOWN, county of Wexford. Lat. 52° 40' N. ; Long. 6° 12' W.— 

 Some difficulty was found at this station in selecting a suitable position for the 

 tide-gauge, in consequence of the harbour having become partially filled with 

 sand and gravel, forced into it by the sea. The gauge was placed beside the 

 wooden landing stage, in the open sea, in rather an exposed position. 



Its zero was found to be 17'13 feet below the copper bolt driven vertically 

 into one of the facing-stones of the entrance to the harbour. 



XII. DuNMORE (East), county of AYaterford. Lat. 52' 8' N. ; Long. 6° 57' 

 W. — The tide-gauge was erected at the inner angle of the harbour, in a very 

 sheltered position. 



Its zero was referred to the copper bolt driven vertically into one of the 

 facing-stones of the pier, not far from the light-house. It was found to be 17'59 

 feet below this bolt. 



The twelve tidal stations just described were established between Septem- 

 ber, 1850, and January, 1851, and were each visited twice during the observa- 

 tions, by either Dr. Llotd or mj'self In these visits we were assisted by the 

 following gentlemen, who rendered valuable assistance by their suggestions, and 

 in levelling from the bench-marks to the zero of the gauges: — James Apjohn, 

 M. D., Henry Head, ]M. D., Rev. Joseph A.Galbraith, James R. BuLAVER,Esq., 

 Walter R. Bulwer, Esq., and J. Hancock Haughton, Esq. The time was 

 found at each station by means of a vertical gnomon, with a meridian line, the ob- 

 servation of which at midday, witli the aid of a table of the equation of time 

 furnished to each observer, gave the local time with considerable accuracy. 



The tide-gauge consisted of a wooden case, from twenty to twenty-eight 

 feet in length, placed in a vertical position, and closed at the bottom, excepting 

 a few holes, guarded by copper gauze. The bottom of the case was placed four 

 or five feet below low-water mark, and the oscillations of the water outside were 

 scarcely sensible within the case. To the top of the case was attached a box, 



