TRACT 34.

137

IN GUNNERY, 1791.’

178. July 28, 1791.Barometer 29'83 ; Thermometer 66.

N°

Pow-

der

Lengthof charge

Vibrationof gun

1

oz

32

inches

6-8

338

2

32

6-7

343

3

24

5'2

252

4

24

5-25'

254

5

16

3'85

157

6

16

3-75

160

7

8

2-75

75

8

8

2-6.5

76

Fired the same medium gunwith the same charges ofpowder as before, but with-out balls. The results arehere annexed.

Eprouvetle.

Oz Chord Vers.

2 43 9^

2 43i 9|

The pendulum having also been again repaired, with theaddition of a new core, and strong iron bands across theback, to prevent the wood from bursting out behind;weighed it, and balanced for the centre of gravity, as below:

Its weight was . 18031b

Cent, of grav. one side 76'7Ditto the other side 77 - 2

Medium of both 76-95weight of the iron cross barscentre of gravity by - 4 of anwhat it was before, makes it '

And it may be presumedthis last number is verynear the truth, as the cal-culation on the additionalabove mentioned, alters theinch, which added to lb'<'5,6'9, almost the same as that

•annexed.

179. Sept. 14, 1791.

Barometer 30-2 ; Thermometer 70.

Suspended the long 6-pounder gun, and discharged itagainst the before-mentioned pendulum, from the distanceof 200 feet, for the resistance of the air.

Oz

Eprowvette,Chord Vers.

Are. ,

Distance of the gun, 200ft.

2

43

9 A

24°50' !

2

434

25 0 j

Diam. of the balls, 3’55 in.

2

3

43|

&

q.l* j

25 0 j

Weight of ditto, 6lb lpoz.