CLYDE SEA AREA. 



157 



shows how the amount of transference of heat per square mile depends on the depth of 

 the water, each square mile of the Arran Basin receiving and parting with nearly three 

 times as much heat as a square mile of the Gareloch, supposing all the heat to enter 

 and leave by the surface. Earlier discussions showed, however, that a large part of the 

 heat in the seaward division of the Area came not from the sun but from the sea, 

 hence it is probable that distance from the Channel and isolation as well as the shallow- 



Table LXVII. — Heat Storing Power of the Divisions of the Clyde Sea Area. 



Division. 



Area. 



Gareloch-D egrees. 



Average 

 Depth. 



Average 

 Axial 

 Depth. 



Average 



Heat Stored, 



1886-87. 



Average 

 Heat Re- 

 turned, 



1886-87. 



Heat Stored 



per square 



Mile. 



Heat Re- 

 turned per 

 sq. Mile. 



Gareloch, . . . 

 Loch Goil, . . . 

 LochFyne, . . . 

 Arran Basin, . . 

 Total, C. S. A., 



4-23 

 336 



28-44 



685-00 



1164-33 



13-75 



15-09 



144-67 



6292-01 



13-70 



14-00 



121-52 



6019-15 



3-25 

 4-49 

 5-08 

 9-18 



3-24 



4-16 

 4-27 



8-78 



n 



14 



34 

 29 



18 



m 



68 



ness of the water have a good deal to do with reducing the surface heat transactions. 

 The difference in depth between Lochs Goil and Fyne would suggest a greater difference 

 in thermal power than is found, while the difference in depth between Loch Fyne and 

 the Arran Basin would suggest a less difference than occurs, if depth were the only or 

 the main agent in producing the difference. We are probably not far wrong in sur- 

 mising that from one-half to two-thirds of the heat stored and lost by the Arran Basin is 

 independent of local solar radiation, and depends entirely on tidal mixture with sea-water. 



The total heat absorbed in a year and returned by the Clyde Sea Area must be 

 equivalent to about 2,010,000,000,000,000,000 foot pounds. Taking a horse-power as 

 33,000 foot pounds per minute, the heat of the Clyde Sea Area, as it is given out from 

 September to March, is equivalent if it were all turned into work to the performance of 

 an engine of 3,700,000 horse-power. 



It is interesting to notice that in 1887, notwithstanding the high maximum tempera- 

 ture, much less heat was stored than in 1886, the low minimum with which 1886 started 

 accounting for the fact. 



I do not profess to have exhausted my subject, for the observations would in several 

 instances stand more rigorous treatment ; but there are so many points in which farther 



