364

NEW EXPERIMENTS

TRACT 34v

Of the plugs every 10 inches weighed 12 ounces.

The Gun was n° 2.-Its weight - - - 917

Tocentreofgravity 80-47To the tape - - 110

Oscillation per min. 40'6,as beforeIt heated very little by firing.

The Pendulum. -Its weight - 690

To the tape 117‘S

It had been gutted, and repaired, by placing a stratumof lead, of two inches thick, before the iron plate, thenthe lead was covered with a block of wood, and the wholefaced with sheet lead.

2 02

4 o z

8 oz

16 oz

Mean recoil with ball -

10-15

16-7

27-43

39-60

Ditto without - - -

2-50

5-7

12-95

25-98

The difference or c =

7-65

11-0

14-48

13-62

Hence velocity by recoil

840

1207

1592

1499

Mean ditto by pendulum

793

1135

1566

1660

Difference - - - -

+47

+72

+ 26

- 161

Or the part - - -

I

T T

I

Tfi

I '

T"5-

So that the recoil gives the velocity with 2, 4, and 8ounces of powder greater, but with 16 ounces much less,than the velocity shown by the pendulum.