Diurnal Tides on the Coasts of Ireland. 37 



IV. BuNOWN, county of Galway. Lat. 53° 24' N. ; Long. 10^ 2' W.— The 

 tide-gauge at this station was erected at the inner side of the new pier built for 

 the accommodation of fishing-boats, and was well sheltered from the west and 

 south-west. 



V. KiLLYBEGS, county of Donegal. Lat. 54° 38' N. ; Long. 8° 24' W.— 

 Owing to the impossibility of erecting a tide-gauge at this station, in a position 

 which would not be left dry at low water, it was determined to dispense with 

 the daily observations, and to make the weekly observations with two tide-poles, 

 one of which was fixed to the pier near the Coast-guard house, and the other 

 on a rock at a short distance from the shore, the latter being used only when 

 the base of the pier was dry at low water of spring tides. The correspondence 

 of the figures on the two poles was carefully verified. 



The zero of the tide-pole was 18-00 feet belowthe coping-stone of the pier 

 to which it was fastened. 



VL Ratumullan, county of Donegal. Lat. 55° 7' N. ; Long. 7° 32' W. 



The tide-gauge was erected in a sheltered situation, at the inner side of the pier. 



Its zero was 20-20 feet below the upper surface of the corner coping-stone 

 at the southern end of the pier. 



Vir. PoRTRusH, county of Antrim. Lat. 55° 12' N. ; Long. 6° 38' W.— 

 The tide-gauge was erected in an angle of the northern pier, close to the spot 

 in which the tidal observations were made in 1842. It was referred to the 

 copper bolt driven vertically into one of the facing-stones of the quay, and its 

 zero was found to be 12-58 feet below this bolt. 



VIII. CusHENDALL, county of Antrim. Lat. 55° 4' N. ; Long. 6° 4' W. 



The tide-gauge at this station was erected on the landward side of the new pier 

 in Red Bay. 



The zero of the gauge was referred to the Ordnance bench-mark on the top 

 of the wall, at the road side, north of the tunnel above the pier ; it was found 

 to be 34-74 feet below this mark. 



IX. DoNAGHADEE, county of Down. Lat. 54° 38' N. ; Long. 5° 33' W.— 

 The tide-gauge was erected beside the pier, close to the bolt driven vertically 

 mto one of the facing-stones of the quay, in a sheltered position, and with deep 

 water at the lowest tides. 



The zero of the gauge was 19-80 feet below this bolt. 



