1054 
PROFESSOR W. N. HARTLEY OX 
Plate 10. “Blow” 89, Vessel No. 2. 
Position of flame on the slit, diagonal. An Ilford instantaneous plate, not stained, 
was used. 
b. 
m. 
Duration of exposun 
Commencement of tbe “blow”. 
11 
5 
Tbe sodium line appeared at , '. 
11 
12 
1st exposure, both potassium and litbium lines were 
visible . 
11 
16 
4 minutes 
2nd exposure. 
11 
20 
3 „ 
Tbe “bloAv” was stopped at. 
11 
23 
Tbe converter wms lowmred in order to throw in 
scrap to cool tbe metal, wbicb bad become too 
bot. 
“ Blow ” started again at. 
IL 
254 
3rd exposure. 
11 
27 
• ) 
4tb exposure commenced at. 
11 
30 
End of “ blow ”. 
11 
50 
20 secs. 
The duration of the 4t]i exposure was only 20 seconds, 
of spectra. 
This is an excellent series 
Plate 11. “Blow ”90. Vessel No. 3. 
Tlie flame fell diagonally on the slit. The plate used was one of Edwards’ 
isochromatic instantaneous make, stained with cyanine. 
The camera was adjusted so as to bring the red end of the spectrum into shar])er 
focus. 
b. 
m. 
secs. 
Duration of exposure. 
Commencement of “ blow ” at. 
This was a lai’ger cbai'ge than usual. 
. 12 
31 
30 
The sodium line appeared at . . . . , 
. . 12 
40 
0 
Tbe litbium line at. 
. 12 
43 
0 
1st exposure at. 
. 12 
46 
30 
85 secs. 
2nd ex])osure commenced at. 
. 12 
51 
45 
5|: minutes. 
Ended at. 
. 12 
57 
0 
The spectrum of another “ blow ” was photographed on 
Vessel No. 1, 
The position of the flame as before. 
li. m. secs. 
Commencement of the “ blow ” at.1 22 0 
1st exposure at.1 33 0 
Continued till. 1 35 30 
2ncl exposure.1 38 15 
Continued till. 1 44 30 
The “ blow ” was inten uptcd and tbe converter 
turned down at. 1 35 30 
And up again at . I 37 45 
this plate. “ Blow ”91. 
Duration of exposure. 
3 minutes 
