The Rev. II. Lloyd on the Meteorology of Ireland. 



433 



Temperature of the Sea. 



Provision was made that the temperature of the sea should l3e observed at 

 all the places at which tidal observations were made. For this purpose each 

 station was furnished with a thermometer, having its bulb inclosed within a 

 small reservoir of copper, for the double purpose of guarding it from accident, 

 and of protecting it (by means of the contained water) from rapid changes of 

 temperature when it was lifted into the air for observation. The observer was 

 instructed to note its indications twice in the day, at intervals of about twelve 

 hours, the thermometer being attached to a pole, and plunged to the depth of 

 about one foot in deep water. The diurnal change of the temperature of the 

 sea being very small, it is completely eliminated by two such observations. At 

 many of the stations the instrument was lost, or broken, in the attempt to use 

 it during boisterous weather. We are, therefore, only in possession of results 

 from six stations, which are contained in the following Table : — 



Table XII. Temperature of the Sea (Monthly Means). 



Feb. 



Mar. 



Apr. 



May. June. 



July. ^ Aug. 



Sept. 



Oct. 1 Xov. I Dec. 



Year. 



Portrush, . . 

 Cushendall, . 

 Donaghadee, 

 Bunown, , . 

 Courtown, . . 

 Castletownsend, 



46° 9 

 46-6 

 46 -5 

 48 -T' 

 46-0 

 47-1 



45° 6 45' 

 45 



/ 47 •950°-6'54°-357°-5 58°-7,58°-754°-9'49°-647°-85r 

 45 -6147 -2 49 -Vm 155 -457 -058 -355 -651 -649 -451 

 45 -6148 -llSO •3|52 •5'55 -8 57 -4157 '5 54 •7'50 '149 -3 51 

 50 •9;51 -454 -457 '8 60 -2 62 -961 -5 55 ■r49 -348 -1 54 



I 47 ■9!46 -852 

 8 49-2,48 -6 52 



45 

 49 



45 -1 45 -8 48 -3:53 ■258 -4 61 '863 .5;60 •956 



46 -646 -8 49 753 •5'56 -3 60 -3 61 -3 60 354 



Means, . . . 

 Differences, 



47 -0 

 -5 -3 



46°-3 46°-7 48°-8 5 1°-9 55°-2 5S°-5 60°-I 59°-5 55°-2 

 -5 -91-5 -a-S -5-0 -41+3 -0+6 -21+7 -9+7 •2'+3 '0 



49°-6'48°-3'52°-3 

 -2 -6-3 -91 



In the last two lines of the Table are given the mean results of the six sta- 

 tions, and the diiferences between them and the mean of the entire year. These 



* At Bunown and Courtown no observations of sea temperature were made in January. 

 The results in the Table for that month are the means of the temperatures of December and 

 February. 



