Birft* That Engli/h-imn and fuch others, as are well verfed i n 
the Englifb tongue., find no difficulty in underftanding the deft 
criptions of thefe Engine, nor in apprehending their ftru&nre, 
exhibited by the Figures, efpeciallyif notice be taken of the E« 
mendation, expreffed at the end of JSum. to. about the mifgra- 
ving the Bended end of the Springing Wire,( which it feems has not 
been noted in France, though the faidiVw2.10.is known to have 
been feen there a pretty while before their Journal of May 24. 
was publifh’t, ) And as for the particular of the Bucket , fetching 
water from the bottom of the Sea, both the Figure and the an- 
nexed Defi/iption thereof are fo plain and clear, that 'tis fome 
wonder here, that any difficulty of underftanding them is pre- 
tended by any, that hath but ordinary skill in Cutts and the Eng- 
lijh language. Mean while, that way, which the French Author 
recommends for this purpofe as more firnple , Videl. a Brafs - 
Tump with double Valves , is not at all unknown in England \ nor 
has bin left untried therejbut was found inconvenient, in refped: 
that the Valves in defending did not fully open, and give the 
water a free paflfage through the Cavity of the Veffel , nor in 
afeending fhut fo clofe, Is to hinder the water from coming in 
at the top : Whereas by tlieway, propofed in Num. 9. both is 
perform'd with great eale and fecurity. 
Secondly , Whereas the French Author is of opinion, that ’tis 
unknown, How much time a Heavy Body requires to fink in 
water, according to a certain depth; He may pleafe to take no* 
tice , that that hath been made out in England by frequent Ex- 
periments ; by which, feveral Depths, found by this Method of 
founding without a Line, were examin’d by trying them over a- 
gain in the feme place with a Line, after the common way . And as 
to that Qtyere of his, Whether a heavy Body defeends in the fame 
proportion of fwifenefs in Water , that it would do in Air ? The 
anfwer is, that it does not ; but that, after it is funk one or two 
fathoms into the Water, it has there arrived to its greateft fwife- 
nefs, and keeps, after that, an equal degree of velocity sthe J{e- 
fiflanceof the water being-then found equal to the Endeavour of 
the heavy Body downward?. 
Thirdly, When the fame Author alledges that it muft be known,, 
when a .Light Body reafeends from the bottom of the water to* 
the 
