( 1 54 ) 
totes 3 and fo of all the reft of the Curves, as in the 
Figures 2, $, 4, 5, 6 . which are the refult of the feve- 
ral Angles, made by the touching Sides of the Planes. 
Now when the touching Sides were plac'd upwards, 
parallel to the Surface of the Water (as in Fig 7.J and 
plung’d wholly under the fame, then upon lifting them 
up, in the fame Pofition, till the weight of the Water 
between the Planes over-ballanc’d the Power of their 
Attra&ion, two Curves, one from each fide of the 
Planes, would open themfelves, and meet each other in 
the middle, as reprefented in the aforefaid Figure 3 
where they would unite, and make a Figure as joind 
by the prick’d Lines, being wider in the middle than 
towards the (Ides of the Planes. And it is highly remar- 
kable, that this Curve would always break out between 
the Planes, at an equal diftance between the touching 
fides and the Surface of the Water. 
The fame Figure is likewife produc’d between two 
round Glafs Planes, (fee Fig 8.) the Afiymptotes be- 
ing the fame as the former ; that is to fay, one the Sur- 
face of the Water, the other a Tangent drawn from the 
touching Point, parallel to a Tangent drawn from the 
open or oppolite part of the Planes, being at right An- 
gles with a Line drawn thro’ the Axis of the fame. Thefe 
Experiments I find to anfwer the fame in Vacuo, as in 
the open Air 3 fo that that Element has nothing to do 
in this extraordinary appearance. 
The Planes made ufe of in the foregoing Experiments 
were about 7 Inches fquare, open’d on one fide to an 
Angle of 20 Minutes or thereabouts 3 the round Planes 
were in Diameter near 3 Inches.. 
XIV. A 
