CLYDE SEA AREA. 



77 



by the bearing Fairy Hill S.E. ^ E. 2^ miles, which is in mid-channel opposite Furnace 

 Quarry, and the depth is 35 fathoms. This point is on the threshold of the Upper 

 Basin of Loch F^yae, which deepens abruptly to the east, while to the west there is 

 a stretch of 3 miles, averaging 35 fathoms in depth along the axis, with very slight 

 irregularity, then rising to form the Minard bar. 



The density of the water was found to be as follows : — 



Surface, 9 observations. 

 Mean, .... 102380 

 Maximum, . . . 102452 



Minimum, . . . 102134 



Average percentage of pure sea-water, 91 



Bottom, 9 observations. 



102463 



102488 



102421 



947 



In vertical section 941, or in normal year 93"8. 



Table XXVII. — Temperature Observations at Furnace. 



No. . . . 



Date 



No. of Points 



Temp. . . 



Slope . . 



Actual Slope 



1 

 19.4.86 



7 

 42-2 

 + 0-8 



2 3 



22.6.86 jll.8.86 



7 15 



44-2 j 47-8 



+ 2-1 | +8-1 

 + 2-9 



0-8 I 



4 5 6 7 



27.9.861 16.11.86 I 29.12.86 I 5.2.87 



10 



49-3 

 + 6-5 



8 

 49-7 

 + 0-2 

 0-6 



-U'D | 



+ 0-8 I 



6 6 



47-0 I 44-6 

 -1-4 1-2-3 



-1-8. 



+ 0-4 f 



8 



29.3.87 



9 



44-2 



+ 0-5 



9 



10.5.87 



6 



45-0 



+ 0-8 



10 



15.6.87 



12 



48-2 



+ 4-5 



No. ... 

 Date . . . 

 No. of Points 

 Temp, . . 

 Slope . . . 



Actual Slope 



11 



12 



13 



14 



15 



16 



17 



18 



19 



8.7.87 



15.8.87 



23.9.87 



16.12.87 



3.1.88 



6.1.88 



14.2.88 



22.3.88 



25.8.88 



14 



11 



9 



9 



6 



6 



9 



6 



12 



49-9 



50-9 



52-2 



47-9 



47 3 



47-1 



45-6 



43-2 



50-1 



+ 8-8 



+ 7-0 



+ 3-9 



-2-0 



-0-3 



-04 



-0-6 i 

 + 0-2 1 



-1-5 

 -2-5 i 

 + 1-0 / 



-0-7 



+ 7-5 















... 



20 

 16.10.* 

 6 



49-5 

 + 1-0 



The observations at Furnace show on the whole less range than those at Dunderawe, 

 both places occupying similar positions at either end of the Upper Basin, and the depths 

 being equal. The mean temperatures were somewhat higher in winter and somewhat 

 lower in summer at Furnace. This greater uniformity is well shown in Curve 9 (May 

 1887) of each set (compare fig. 28, Plate XXVIIL, and fig. 36, Plate XXIX.). For 

 Furnace the curve is a straight line of mean 45° - reduced range + 0° "8, and for 

 Dunderawe it has mean 45°'8 and reduced range -I- 5°*2. 



At Furnace there is a marked tendency towards S-shaped curves, more distinct than 

 those seen in the Gareloch, and showing a tendency, as in No. 10 (fig. 28), to pass into 



