( «J' ) 
XII. An Account of an Experiment touching the Pro- 
portions of the Ajcent ef Spirit of Wine between two 
Glafs Planes , whofe Surfaces were plac'd at certain 
different Vijlances from each other. <By the late 
Mr. Francis Hauksbee, F. R. S. 
I Took two Glafs Planes, about 6 Inches long, and two 
broad : Thefe (being made clean) I feparared at 
each end by the number of 32 pieces of Brals Latxint, 
whofe thicknefs, when laid one upon another, and 
prefs’d together by Screws, made a diftance between the 
Planes equal to (as near as I could meafure) & of an 
Inch. Being thus prepar’d, I plung’d one end of them 
into fome ting’d Spirit of Wine 5 and after I had wetted 
the inward Surfaces of the Planes with it, by declining 
the upper end, I fet them upright ^ and found that the 
Surface of the Wine between them remain’d, higher 
than the Surface of the Wine on their outfides, by a 
diftance equal to the firft Line C D above the Line 
A B, the Line A B being the common Surface, in all the 
tryals, on the outfide of the Planes. ( See the Scheme 
hereunto annext ) After this, I reduc’d the diftances of 
the Planes to half the former, by taking away 16 of 
the Brafs Lamina from each end of them $ then being 
plung’d into the Liquid, and ufed in all rcfpe£fo as be- 
fore, I found the Wine to hand between the Planes 
juft double the height it ftood at in the former trval 5 
as may be obferv’d by the Line E F in the Scheme., 
Again removing half the number of Brafs pieces, where- 
by but 2 of them were left at each end, and uling them 
