nd row, and the height of the subjacent _Cylinder_ of
_Mercury_ in the first, and the greatest height of the _Cylinder_ of
_Mercury_, which of it self counterballances the whole pressure of the
_Atmosphere_; by substracting the numbers of the first row out of the
numbers of the third, you will have the measure of the _Cylinders_ so
deprest, and consequently the force of the Air, in the several Expansions,
registred.

The height of the The Expansion The height of The strength
Cylinder of Mercury, of the Air. the Mercury of the Elater
that, together with that counter- of the expanded
the Elater of the ballanc'd the Air.
included Air, Atmosphere.
ballanced the
pressure of the
Atmosphere.
---------- ---------- ---------- ----------
00 01 30 30
02 01-1/16 30 28
04 01-1/7 30 26
06 01-2/9 30 24
08 01-1/3 30 22
10 01-1/2 30 20
12 01-2/3 30 18
14 01-5/6 30 16
16 02-2/27 30 14
18 02-4/9 30 12
20 03 30 10
22 03-7/9 30 8
24 05-7/18 30 6
25 06-2/3 30 5
26 08-1/2 30 4
26-1/4 09-1/2 30 3-3/4
26-1/2 10-3/4 30 3-1/2
26-3/4 13 30 3-1/4
27 15-1/2 30 3

I had several other Tables of my Observations, and Calculations, which I
then made; but it being above a twelve month since I made them; and by that
means having forgot many circumstances and particulars, I was resolved to
make them over once again, which I did _August_ the second 1661. with the
very same Tube which I used the year before, when I first made the
Expe