FLAME SPECTRA AT HIGH TEMPERATURES. 
1057 
Plate 7. 
The same remark applies to this plate. The photograph was iiot satisfactory. 
The preceding work had been carried on in the open air, hut it was considered 
better to move to the old Bessemer plant and be under cover, and away from the 
clouds of fume which were driven towards one by the wind, which still continued to 
blow from the east. Hot blast, grey pig iron, containing not less than 2 per cent, of 
silicon and from 3|- to 3f per cent, of carbon, was being blown for the production of 
tin-plate iron. Charge of metal 10 tons. 
The position of the instrument was about 4 feet above the mouth of the converter 
and 6 feet from it. 
Plate 8. 
Blowing commenced at 10 hrs. 52^ rain. A.M., but the blast was stopped because 
of blowing going on at the other plant. The blast was turned on again at 12 o’clock, 
the manganese bands flashed out at 12 hrs. 5 min. P.M., and up to this the flame was 
nothing but that of carbonic oxide with the usual alkali metals. 
h. 
m. 
s. 
h. 
m. 
s. 
1st 
exposure (1 minute) at. 
. . 12 
7 
30 
to 
12 
8 
30 
2nd 
„ (1 minute 10 seconds) at 
. . 12 
8 
30 
12 
9 
40 
3rd 
,, (30 seconds) at. 
. . 12 
9 
40 
12 
10 
10 
4th 
„ (1 minute) at. 
. . 12 
10 
10 
12 
11 
10 
5th 
,, (3 minutes) at. 
. . 12 
11 
10 
12 
14 
10 
6th 
,, (2 minutes) at. 
. . 12 
15 
0 
12 
17 
0 
At the highest temperatures the flame was perfectly transparent. 
A great quantit}^ of fume, which condensed to coarse dust, was blown about, and 
much of this fell into the water used in washing the plates, and on the gelatine films. 
This could not be avoided, for it was necessary to develop the photographs on the 
spot and wash them as soon as developed. 
Plate 9. 
The same metal 
as before. 
Blowino’ commenced at 12 hrs. 
O 
3 min. 
P.M. 
h. 
m. 
h. 
m. 
1 st exposure from 
.12 
9 
to 
12 
10 
2 nd 
?? 
.. 12 
10 
99 
12 
11 
3rd 
55 
.12 
11 
99 
12 
12 
4th 
n 99 
.12 
12 
99 
12 
13 
5th 
99 99 
.12 
13 
99 
12 
14 
6th 
99 
.12 
14 
99 
12 
15 
7th 
99 )) 
.12 
15 
99 
12 
16 
8th 
9 9 99 
.12 
16 
99 
12 
17 
9th 
)) 99 
.12 
17 
99 
12 
18 
10th 
99 99 
.12 
18 
99 
12 
19i 
“ Blow ” ended. 
This plate was badly fogged, 
MDCCCXCIV.—A. 6 T 
