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 Experiment (for it being a very good one, I had carefully preserv’d it:) And after having tryed it over and over again; and being not well satisfied of some particulars, I, at last, having put all things in very good order, and being as attentive, and observant, as possibly I could, of every circumstance requisite to be taken notice of, did register my several Observations in this following Table.  In the making of which, I did not exactly follow the method that I had used at first; but, having lately heard of Mr. Townly’s Hypothesis, I shap’d my course in such sort, as would be most convenient for the examination of that Hypothesis; the event of which you have in the latter part of the last Table.

The other Experiment was, to find what degrees of force were requisite to compress, or condense, the Air into such or such a bulk.