CLYDE SEA AREA. 



99 



And if the mean temperatures for the several layers were a, b, c . 

 temperature (T) of the whole mass is given by 



15-5a+13-3&+9-5c+4-9e&+3-Oe+2-l/+0. 



the weighted mean 



T = 



493 



Table XXXV. — Mean Temperature at various depths in Loch Fyne. 







Days 



Mean 





Mean Temperature 



of Layers. 





Section. 



Date. 



since last 



Temp. 

























Over 

 60 







Trip. 



Weighted. 



0-10 



10-20 20-30 



1 



30-40 



40-50 



50-60 



I. . 



20.4.86 





42-06 



42-52 



42-00 



41-88 



41-76 



41-63 



41-56 



41-50 



II. 





21.6.86 



62 



44-43 



46-25 



43-56 



43-40 



43-56 



43-90 



44-05 



44-10 



III. 





10.8.86 



50 



47-94 



51-18 



48-25 



46-45 



44-54 



44-01 



44-12 



44-18 



IV. 





27.9.86 



48 



49-85 



52-18 



51-40 



49-27 



46-19 



44-70 



44-13 



44 00 



V. 





16.11.86 



50 



49-02 



48-84 



49-91 



49-81 



49-71 



46-58 



45-15 



44-50 



VI. 





29.12.86 



43 



46-44 



45-46 



47-04 



47-19 



47-05 



46-44 



45-60 



45-05 



VII. 





4.2.87 



37 



44-74 



43-73 



44-58 



45-00 



45-97 



46-40 



46-19 



46-04 



VIII. 





29.3.87 



53 



44-40 



44-47 



44-30 



44-31 



44-36 



44-54 



44-60 



44-80 



IX. 





10.5.87 



42 



45-35 



46-52 



45-24 



44-67 



44-30 



44-40 



44-59 



44-68 



X. 





15.6.87 



36 



47-74 



50-GO 



47-69 



46-77 



46-00 



45-12 



44-93 



44-80 



XI. 





7.7.87 



22 



48-81 



51-78 



48-44 



47-80 



46-67 



45-43 



45-30 



45-20 



XII. 





15.8.87 



39 



50-29 



53-30 



50-75 



49-31 



47-16 



45-98 



45-56 



45-15 



XIII. 





23.9.87 



39 



51-42 



53-22 



52-30 



51-63 



49-28 



46-89 



46 00 



45-40 



XIV. 





16.12.87 



84 



47-23 



46-00 



47-56 



48-03 



48-12 



48-00 



47-55 



47-00 



XV. 





14.2.88 



60 



45-37 



45-02 



45-68 



45-52 



45-37 



45-40 



45-35 



45-30 



XVI. 





22.3.88 



36 



43-33 



43-10 



43-18 



43-37 



43-65 



43-90 



44-00 



44-00 



XVII. 





2.6,88 



73 



45-36 



46-22 



45-47 



44-68 



43-95 



43-60 



43-40 



43-30 



XVIII. 









16.9.88 



106 



48-71 



49-83 



49-64 



48-79 



47-31 



45-40 



44-80 



43-50 



Table XX XV. gives for each of the eighteen complete sections the date, number of clays 

 elapsing since previous trip, the weighted mean temperature of the mass of water, and 

 the actual mean temperature of the seven ten-fathom layers. A selection of these 

 figures is represented graphically in the curve, fig. 41, Plate XXX. On this curve also the 

 mean temperature of the air at Callton Mor is given as an indication of the actual air- 

 temperature over Loch Fyne. The air-temperature has the greatest range and is the 

 earliest in phase ; the surface layer of 5 fathoms follows the air-temperature with a much 

 diminished range, its maximum occurring 45 days later in 1886, and about 50 days 

 later in 1887. The minimum is not easily compared, as the air-temperature on both 

 occasions showed a double minimum three months apart, the surface-water minimum 

 occurring between the two in 1887, and coincidently with the later air-minimum in 

 1888. The water at 35 fathoms deep (mean of the layer 30 to 40 fathoms) had a less 

 range, and its maximum was retarded 126 days after the air-maximum in 1886 and 

 about 120 days in 1887. The minimum was 75 days later than that of the surface 

 water in 1887, but synchronised with it in 1888. The bottom layer of 10 fathoms 

 showed a very small range. The maximum was retarded 212 days after the air- 



