36
NEW EXPERIMENTS
TRACT 34 .
91. Thursday, September 8, 1785 \from 12 to 3.
The weather close and warm, rather hazy.
Barometer 30‘O2 ; Thermometer 65" within, but warmer
without.
N°
Pow-
der
Ball’s
Time
Range
Whereabouts the Balls fell
wt
<liam
oz
oz dr
inches
sec
feet
1
8
16 12
1-96
14
6460
Near the middle of the river
2
•
• •
•
6080
Near the north side
3
4
•
* *
.
15
6040
Ditto
5
.
•
is*
6540|Ditto
6
* m
•
15
6460|Near the middle
7
#
, .
•
14
5720,On the south bank, and within
means
14.-7
6216
40 yds. of the lower station e
These 7 rounds were fired down the river from the same-place as before ; the elevation of the gun being 15 degrees,and all other circumstances the same as before. Thegun was pointed nearly to the middle of the river ; yet theballs fell mostly wide of the direction, and that both ways,,some falling near one side of the river, and some near theother, though there was not the least vrind. The times offlight were taken with a stop watch, at the lower station ofobservers at e, by noting the time between seeing the flashof the gun and the plunge of the ball in the water. Theyrun from 14 to lS-t seconds, and accord very well with theranges, the larger to the larger : the medium is 14'7 se-conds; and the medium range 6216 feet, or 2072 yards.N 8 3 was not seen. The mean length of charge 4'8 inches.
The same parties of young gentlemen kept their stationvery gallantly, and made no hesitation in offering to attendand observe there for the remainder of the experiments,though some of the balls this day again fell near them, andone indeed within 40 yards of them.