This 36K GIF is of Robert Boyle. Just to be safe, that's not his real hair. Wigs were the fashion in his day. The table below shows the values Boyle collected.
All measurements are in inches.
And Weight of the Air . A - The number of equal spaces in the shorter leg, that contained the same parcal of air diversely extended. B - The height of the mercurial cylinder in the longer leg, that compressed the air into those dimensions. The Aggregate of the last columns B and C, exhibiting the pressure sustained by the included air. What that pressure should be according to the hypothesis, that supposes the pressures and expansions to be in reciprocal proportions.