button to main menu  Otley's Guide 1823 (5th edn 1834)

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Page 19:-
Within the last thirty years it has emerged eight times; remaining upon the surface for longer or shorter periods. In a succeeding part of this work the discussion of this subject will be resumed at greater length.
  bottom wind
Another peculiarity has been attributed to this lake in what is called the Bottom Wind: which has been described as an agitation of the water occurring when no wind can be felt on any part of the lake. It has been supposed to originate at the bottom of the water; and some, associating this with the last mentioned phenomenon, have ascribed both to those subterranean convulsions by which earthquakes are produced. Although it be admitted, that the waves are sometimes greater than could be reasonably expected, from any wind perceivable at the time; yet, it may be doubted whether they are ever formed when no wind is stirring: and if such a term as 'Bottom wind' must still be retained, I think it ought to be referred to the bottom of the atmosphere, rather than the bottom of the lake.

The depth of Derwent Lake does not in any part exceed fourteen fathoms: a great portion of it scarcely one fourth of that measure. It is supplied chiefly from Borrowdale, and forms a reservoir for the water, which in heavy rains pours down the steep mountains on every side; by which means its surface is often raised six or seven feet; and in an extraordinary case has been known to rise a perpendicular height of eight feet, above its lowest water
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button -- "Derwent Lake" -- Derwent Water
button -- (floating island, Derwent Water)
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