( 5 <*» ) 
My Contrivance therefore is a Machine which will 
carry down .Mr. Hales's Gage to the Bottom of the Sea, 
and immediately bring it up again. See the Figure. 
A R, is the Gage Bottle. 
F f, the Gage Tube cemented to the Brafs Cap of the 
Bottle at G, with its open End f immers’d in the Mer- 
cury C, which by the Preffure of 31 Foot of Water 
is carried up to d with a little Treacle or Honey d up- 
on ir, rais’d up from D, a fmall Thicknefs of Treacle 
pour’d on upon the Mercury. 
When the Preffure of Water is from a Depth of 
64 Foot, the Mercury and Treacle rife up to E, | of the 
Height of the Tube j and fo higher proportionably to 
the Depth. J 
N. R. A Scale may be^mark'd on the Tube with a 
'Diamond. 
K, is a Weight hanging by its Shank L in a Socket 
m, fix’d to the Ring M B cemented at the Bottom of 
the Bottle. When the Hole L of the Shank is fhov’d 
up to m , , the Catch l of the Spring S holds it from 
falling out of the Socket, whiift the Machine is de- 
fcending. But as foon as K touches the Ground at the 
Bottom of the Sea, the Hole L rifmg, the Catch flies 
back and lets go the Weight, as it is feen in the Figure. 
^ hen the empty Glafs Ball I (which at Sea may be a 
Plog’s Bladder) rifesup to the Surface of the Water with 
the Machine, in which obferving how high the Infide 
of the Tube is daub’d, the PrelTure, and confequently 
the Depth of the Sea is known. J 
FI G, is a Brafs lube to guard the Top of the Gage 
Tube. & 
There are Holes at F, G and E, to admit the Water 
to pafs freelv every w T here. 
Ffff - To 
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