(M?) 
out -a method to calculate, what depth is to be concluded 
from a ay other time of the like Globes.ftay underwater. 
In the fameTryals,made with this Inftrument in the faid Ri- 
ver of Thames , it has-been found, that there is no difference in 
time, between the fubmerfions of the Ball at the greateft 
depth, when it rofe two Wherries length from the place where 
it was let fall (being carried by the Current of the Tide ) and 
when it rofe within a yard or fo of the fame place where it was 
let down. ' 
The other Inftrument, for Fetching up water from the depth 
of the fea, is (as appears by 2 .) a fquare woodden Buc- 
ket C> whofe bottoms EE, are fo contrived, that as the weight 
A, finks the Iron B*(to which the Bucket-C, is faftned by two 
handles DD, on the ends of which are the moveable bottoms 
or Valves EE,)and thereby draws down the^Buckets the reft- 
ftance of the water keeps up the Bucket in the poftnre Cj 
hereby the water hath, all the while it is defeending, a clear 
paffage through s whereas, as foon as the Bucket is pulled up- 
wards by the Line F, the refiftance of the water to that motion 
beats the Bucket downward , and keeps it in the pofture G, 
whereby the Included water is preferved from getting out, 
and the Ambient water kept from getting in. 
By the advantage of which Veffel ; it may be known, whe- 
ther fea water be Salter at and towards the bottom, then at or 
near the top : Like wife, whether in fome places of the fea,any 
fweet water is to be found at the bottom s xhz Affirmative 
whereof is to be met with in xhzEaft Indian Voyages of the in- 
duftrious John Hugh Van Lins choten* who page id ofthat Book, 
as ’ tis Englijhed , records, that in the Ter fan Gulph^ about the 
Ifland Barem, orBabarem, they fetch up with certain Veffels 
(which he deferibes not) water out of the fea 5 from under the 
fait- water., four ©r five fathom deep, as fweet, as any Fountain 
water, xh v 
X 2 Of 
