12 ‘Sir’. H. Pacn’s Defcriptions of the 
in many parts joined each other‘without any boards or uprights 
(as will appear in the fection of the plan), and continued 
through the whole of the wooden frame, againft the weight of 
the mud, quick- -fand, and fea-beach, to the ore of —— 
fix feet. 
The reafon of the circular frames being nearer in fome pad 
than in others, arofe from the greater or lefs quantity of falt- 
water that came through the fands, &c. and often rendered it 
impoffible to fink under the frame more than the thicknefs of 
one of the ribs, without danger of blowing up, or of the fides 
behind the wood flipping with the ftreams of water, and thereby 
forcing into the bottom of the well, which in finking through 
very wet quick-{fand is much to be apprehended; and an acci- 
dent of that nature would entirely deftroy the work. An at- 
tention to the plan will fhew at what depths the filtration of 
water was moit dangerous, and the difficulties at different periods, 
may be eftimated by the diftance of the circles, formed of 
ribs, from each other, and where they appear to join, it was 
not without the utmoft efforts of labour that the work could 
be carried on. At the depth of thirty-fix feet the wood-work 
was finifhed, and fix feet deeper a firm foundation of hard blue 
clay difcovered. The feveral parts of the frame were then 
{trengthened wherever it appeared neceflary, to prevent fepara- 
tion, and to refift the immenfe prefiure of foft mud, quick- 
fand, and loofe fea-beach, which were fupported by it. 
It muft be obferved, that the falt-water, after proceeding 
thus far, came in very faft through all the joints of the frame, 
and that holes were left on purpofe in certain parts to let it run 
into the well, that it might not be confined entirely to the 
bottom of the work, which, from the weight upon one part 
only, 
oe 
