( J<5o ) 
Body from the Top to the Bottom of the Water, to- 
gether with the Time of the Emerfion of the lighter 
Body, reckoned from the difappearing of the Machine, 
till the emergent Body was.feen again, no certain 
Confequence could be drawn from fo precarious and 
complex an Experiment. ^ - 
For even in ftill Water, and in the fame Place, the 
Time will hardly be the fame in two Experiments : 
Much lefs will this Machine anfwer in ‘the Sea, on 
Account of Waves and Currents, and many other 
Hindrances. 
But as the PrelTure of Fluids in all Directions is al- 
ways the fame at the fame Depth, a Gage which ex- 
actly difcovers what the PrelTure is at the Bottom of 
the Sea, will fhew what is. the true Depth of the Sea 
in that Place, whether the Time of theDefcent of the 
Machine be but a Minute or two, or twenty Times' as 
long. 
The Reverend Mr , Hales, in his Vegetable Statieks, 
defcribes his Gage for eftimating the Preflures made* 
in opake VelTels ; where Honey being poured over 
the Surface of Mercury in an open Veffel, rifes upon 
the Surface of the Mercury as it is prelTed up into a 
Tube whofe lower Orifice is immerfed into the Honey 
and Mercury, and whofe Top is hermetically fealed. 
Now as, by the PrelTure, the Air in the Tube is con- 
denfed, and the Mercury rifes, fo the Mercury comes 
down again when the PrelTure is taken off, and would 
leave no IVfcrk of the Height to which it had rifen ; 
but the Honey (or Treacle, which does better) which 
is upon the Mercury, Ricking to the Infide of the Tube, 
leaves a Mark, which Ihews the Height to which the 
Mercury had rifen, and confequently makes appear what 
was the* greateft PrelTure. My 
