93 



expenses of these tours of inspection having been undertaken by 

 the parties themselves, are thereby saved to the Academy. 



The following is a memorandum of the principal facts con- 

 nected with the several stations : 



East Coast Stations. 



Portrcsh (Co. Antrim). — The tide-gauge is erected in an angle 

 of the northern pier, close to the spot at which the tidal observa- 

 tions were made in 1842. It was found necessary, however, to 

 deepen the spot by the removal of rubble, and to protect the dial, 

 by cross beams of timber, from the hawsers of vessels approaching 

 the quay. The zero of the tide-gauge is 12-33 feet below the bench- 

 mark on the quay. 



The barometer is put up in the guard-house, which is situated 

 on an eminence facing the harbour ; and the thermometers and the 

 rain-gauge in a small attached garden. The height of the cistern 

 of the barometer, above the bench-mark, is 23-4 feet. The diameter 

 of the tube is 0'28 of an inch. The four thermometers at this, 

 and at every other station, are inclosed in a shallow box with a 

 sloping roof, open in front. 



A vertical gnomon is fixed in the window sill of the guard-house, 

 for the purpose of deducing the time of noon ; and the observers 

 are furnished at this, and at all the other stations, with a table of 

 the equation of time computed for the present year, and for the mean 

 longitude of Ireland. 



Ccshendall (Co. Antrim). — The tide-gauge is erected on the 

 landward side of the new pier in Red Bay. The pier not being 

 completed, it was found necessary to place the gauge at some little 

 distance, so as to stand clear of the sloping side. It is fixed in its 

 place by a frame-work of wooden spars, bound together by ropes 

 and chains ; and is connected with the pier by a platform, on which 

 a hurricane-house is erected for the shelter of the observer. The 

 time of noon is obtained from a meridian line, marked by a picket 

 driven into the ground, to the north of the coast-guard flag-staff. 



No meteorological observations are taken at this station. 



Donaghadee (Co. Down). — This 'is an excellent station for both 

 meteorological and tidal observations. The tide-gauge is erected on 



