: 
ON EIGHT BALLOON ASCENTS IN 1862. 485 
being sensibly the same as the result on the same day as determined at the 
Observatory. 
On August 18, at Wolverhampton, 
38 vibrations —60-0 .*. one vibration —1-580 
32 ” 50:3 ” ” 1-572 
34s, 54:2 os » | 16595 
30 of 47:9 f oY 1:597 
4)6-344 
Therefore one vibration=1°586 second, 1-586 
At 11,000 feet 26 vibrations =41°5 second. 
Therefore one vibration= 1-590 second. 
A result differing but little from that on the ground, 
August 20, at the Royal Observatory, Greenwich, the time of one vibration 
was 1-580 second. 
August 20, at the height of 3800 feet one vibration =1:583 second. 
On September 5, I did not succeed in getting the time of vibration of the 
magnet at all in the balloon. During this ascent we were almost constantly 
going round and round—a motion fatal to observations of this nature, and 
failure at all times was the rule in these experiments. I commenced many 
series of experiments with the axis of the car in one position relative to the 
cardinal points of the compass, which I found to be different before the observa- 
tions were completed, and consequently the observations were of no value. 
The general result of these experiments is that the magnet vibrates in 
a somewhat longer interval of time at high elevations than on the earth. 
The number of experiments, however, is too few to speak decidedly on this 
point. 
Heienrs AnD APPEARANCE o¥ THE Croups. 
July 17. 
The sky was covered with cumulostratus clouds before starting. 
At 9" 47™ a.m,, at 4467 feet. Clouds were reached. 
At 9° 51™ a.m., at 5802 feet. Many clouds all round at a lower elevation. 
At 9" 53™ a.m., at 7980 feet. Entered a dense cumulostratus cloud. 
At 9" 55™ a.m., at 9000 feet. Passed out of cloud into bright sunshine 
and blue sky 
At 10" 2" a.m., at 11,792 feet. Examined the clouds below, which were 
noted as being very beautiful in form and arrangement. 
At 10" 15™ a.m., at 16,914 feet. Cumuli were underneath and far below ; 
strati in the distance, apparently the same height as the eye. No clouds 
above: blue sky. 
At 11" 38" a.m., at 12,376 feet. On descending the shadow of the balloon 
and car on the cloud below was very large and distinct; entered the cloud 
directly afterwards. 
At 11" 40™ a.m, at 9882 feet. In so dense a cloud that the balloon could 
not be seen. 
At 11" 45" a.m., at 5432 feet. Came out of cloud, but passed through 
others which appeared to be rising with great rapidity. 
