338 ; PROFESSOR PIAZZI SMYTH ON 
Part V.—STEPS or SPECTROSCOPY accorpinc To INCREASING TEMPERATURE AS 
COLLECTED DIRECTLY FROM OBSERVATIONS. 
Referred to in Part II., pp. 289-291. 
SPECTRUM PLACE. 
‘ Wave-NUMBER 
Part. Colour. 
per Britisu Incu. 
25000 to 26000 
26 27 
Ultra-Red. 27 28 
28 29 
29000 30000 
A 30000 to 31000 
a 31 32 
ry Crimson-Red. 32 33 
a 33 34 
fa 7 34000 35000 
35000 to 36000 
RED. 36 37 
— 37 38 
Scarlet. 38 39 
Orange. 39000 40000 
40000 to 41000 
Amber. 41 42 
42 43 
= 43 44 
= Yellow. 44000 45000 
cc 
|— 
oS r 45000 to 46000 
a CITRON. 46 47 
Fis 47 48 
So Green. 48 49 
Lu 49000 50000 
= 
= 50000 to 51000 
= 51 52 
Glaucous. 52 53 
53 54 
54000 55000 
Blue. 55000 to 56000 
56 57 
Indigo. 57 58 
—_s Te 58 59 
s VIOLET. 59000 60000 
a 60000 to 61000 
eu 61 62 
fa Lavender. 62 63 
4 63 64 
S 64000 65000 
> 
65000 to 66000 
66 67 
Gray. 67 68 
68 69 
69000 to 70000 
—— | — | 
orale. | = 
STEP 1. 
TELLURIC- 
Lines 
below 
Freezing. 
CuIEF 
ONEs. 
et 
onnNO WwW ocoooco ROW 
STEP 2. 
ColourEdges 
in Warmed 
Chamber. 
STEP 3. 
FLAME 
LINEs. 
Chief 
Once ALL. 
HM oOonco orp 
GO 6 CO eit SornNrS 
— 
HH DHH 
oo © © 00 
ine) 
bo 
loo on ore >) § ONWrR WO 
bo bd 
Or Go Or 
bo 
~ 
orooo 
et et pe 
aoOornwda 
oo ONOrF OS 
mr om “ICO OW O 
46 |370 
STEP 6. 
CHEMICAL 
to 10 Inch 
Condenser 
Sparks. 
Chief 
Ones! AU 
A 
a 
1] 
il Aa 
0 ae 
i 
i) 
olf 26 
2 34 
12 69 
MIDDLE OF SPECTRUM. 
oy 4. aus 5. 
Tubes with || Lanes with |] LINEs with 6 
1 Inch 2 Inch 
Sparks. Sparks. 
Sil a [el ac 
1 i 
1 1 
4 0 
5 0 
7 5 
6 2 9 
3 6 2 16 
0 4 1 27 
0 7 3 
3} 8 8 
ike 7 8 
1 9 9 
2/ 8 6 
4/11 6 
We 6 
2) 138 9 
1) Wb 2 
1 4 || 14 
1 a 9 
On, 4 2 
3 6 8 
il 6 6 
1 9 1 
se AeA 4 
il 8 5 
1 8 3 
2} 10 3 
2; 8 5 
yal ple 2 
2 8 1 
1 6 il 
2 
1 
87 |220 ||136 |1048 
448 | 2685 
