A484. REPORT—1862. 
«The time the balloon was up was short (two hours), and ozone must be 
in very considerable quantity to produce coloration of the test paper in so 
short a period of time. Still, according to our present notions of increase of 
the quantity of ozone with increase of elevation, papers of ordinary sensitive- 
ness ought to have been coloured during the ascents. The sensitiveness of 
the papers used in the investigation is of course of the utmost importance. 
“Today the quantity of ozone indicated by test papers prepared by 
myself is 4; and two papers from a packet prepared by Messrs. Negretti 
and Zambra, exposed for two hours in sunshine, did not show the slightest 
tinge, while a slip prepared by myself, exposed under similar circumstances, 
gave a degree of coloration equal to the mean of the day. From these 
results it would appear that the test papers used by you were in fault, This 
is a question of some moment, and one of great scientific interest; and if 
future balloon ascents give results similar to those you have reported, then 
the ground of the development of ozone must be looked for in the atmosphere 
near the surface of the earth. 
“T am, yours very truly, 
“ Jas. Glaisher, Esq.” (Signed) «'T, Morrar.” 
In consequence of the receipt of this letter I went to Hawarden to Dr. Moffat, 
and induced him to: make some test papers himself for the balloon experiments. 
He did so, and they were used on August 18th. I took some of the papers 
prepared by him, and some of the papers out of the same packets which I had 
used during the two preceding ascents, as well as some prepared by a formula 
of Schénbein. When I had reached 10,000 feet the new papers were decidedly 
tinged; at 17,000 feet they were coloured to the amount of 2, on a scale 
whose deepest colour is represented by 10; at 20,000 feet to 3. At 22,000 
feet the coloration had increased to 4; and here Schénbein’s paper was 
coloured to 1, and Moffat’s old papers were still uncoloured. Moffat’s 
new papers gradually increased in intensity, and when 3000 feet from the 
earth at 2"38™ were deepened to 7. It would therefore appear that in all 
probability the test papers were in fault in the first ascents; and I may here 
remark that, in consequence, the preparation of the ozone test papers has been 
stopped, and that it is my intention, as Dr. Moffat himself cannot undertake 
the task, to superintend the preparation of the papers myself in future. 
Time or VrsRAtion oF A Magner. 
On July 17, at Wolverhampton, there were 
Ss. Ss. 
30 vibrations of a magnet in 42-1; that is, one vibration in 1-403 
30 ” ” 42:5; ” ” ATT 
30 ¥ 9 42-4; ‘3 3 1-413 
Therefore one vibration =1:411 second. 
At the height of 18,844 feet one vibration = 15-489. 
At the height of 20,244 feet one vibration = 15-536. 
Therefore the time of vibration seemed to be somewhat longer. 
On July 30, at the Royal Observatory, Greenwich, the time of the vibration 
of the magnet =1:573 second. 
On July 30, the mean of four sets of observations at the mean height of 
5300 feet gave 
One vibration =1*-572, 
