TRACT 34.

IN GUNNERY, 1789.

123

in the third, or indeed nearly as the former numbers only, asthe latter are nearly equal. The 10th and 12th balls re-bounded back again from the pendulum.

When the broken off iron band was restored to its placeagain, the pendulum oscillated 3971 times in 10 minutes,which gives n — 39f, nearly the same as at first.

164. November 20.

Weighed the pendulum, and balanced it, for the centreof gravity. Its weight was found 19761b. The centre ofgravity measured 80 - 3, which at the beginning was 79'3, thechange being 1 inch, which is equally distributed among allthe numbers, but reduced by yu. after the iron band brokeoff. On the whole it appears that,

Wtof balls lodged 246lbPlugs ditto . . 3'H

Sum of both 280iWt at first 1748

The sum of all the points struck6154, divided by the number ofthem 69, gives . . : . 89’2

Cent, of gravity at first . 79‘3

the difference of these is 9 - 9

Sum 2028Wt at the end 1976

Lost by evapora- ? ^

tion and splinters 5

Then, as 1976 : 228 : : 9-9 : ITthe computed change in the cen-tre of gravity, being very nearlythe same as it measured,