( 1074 ) 
Experiment VIII. Fall of $c and A. 
fell by Pendulum in 47". 
A fell foul and fo was not obfeiv’d at alL 
Difference taken below 
Experiment IX. Fall of B alone, 
by the Chronometer in 6r", by the Pendulum in 6 \"\ 
Experiment X. Fall of C alone 
by the Chronometer in 6 j" by tlie Pendulum in 
By Galileos Theory the Lead, which was 4'r" in fal- 
ling, muff fall 4 Foot the firft or 16 Feet the firfl: 
Second, which amounts to 314 Feet in 4r". But as 
the Sound of the Ball (as it Ilruck the Bottom) by which 
we reckon’d our Time, had xyx Feet to move, we muff 
abate a ‘ of a Second nearly, fruppofing Sound ta 
move one Mile in ^\") which will take away 35 Feet, 
that the Body muft have fallen in the latk ~ of a Se- 
cond, and reduce the number of Feet to aSp : fo that 
the Lead will have only fallen 17 Feet Ihort of the 
Theory, which muff be attributed to the Refiftance of 
the Air. 
The large Glafs Ball in the 6 Seconds of its Fall, wou’d 
ina i^4r»»wgo thro’ 576 Feet.* but taking away the laft 
- of a Second or 47 Feet, for motion of Sound, it muff 
only fall 5x9 Feet in Facuo. Now fince it fell but 
27 there have been 2^7 Feet taken off* from the Fall, 
by the Air’s Refiftance. 
Likewife the Paff board Ball in 6 \ Seconds muff 
have fallen 676 Feet: but deducting the laft quarter 
of a Second or 51 Feet for the motion of the Sound, theie 
remains only 625 Feet for its fall in Vacuo. But as 
k fell only 27a Feet, we muft allow a Retardment of 
3^3 Feet for the Refiftance of the Airv 
