300 PROFESSOR PIAZZI SMYTH ON 
Appear- PLACE- Differences 
Co’our of the Intensity ance by. Micrometer DATA, Chemical-origin- Concluded 
Continuous Object observed, generallv a black, fixed of black, or Sreniienl Reading. i fr ng “ data aed aoe 2 a 
Spectrum at Fraunhofer Line. thickness £ eel Giating Noe Angstrom, PLACE per Sa 
the Place. of line. symbol Rey. mal Solar Thalen, &€. British Inch. 3 8 
Spectrum. aA 
Faintest haze band—lIst edge, . : 0°3 147400 - 40 423 
and edge, “| 03 14-470 Telluric. ||} 40 440 || 17 
Stronger haze band—Ist edge, 015 14°505 ) : 40 453 
ond edge, . 0-5 14532 ( Telluric. |) 40.460 || @ 
Still stronger, but narrow haze band— 
Ist edge, . f 1:0 “705 14:565 5 40 469 
and edge, . j 10 HH 14590 40 464 Telluric. 40 480 11 
The above three bands constitute the @ band in the high Sun spectrum. They are there, the most delicate trace 
imaginable, like three faint touches of water-colour laid on an engraving with a small crow- quill camel’s-hair pencil, 
This a band i is telluric of course, blackens exceedingly, terrifically, spreading at the same time redward, towards sunset, 
and in dry weather as much as wet, Its constituent or originating gas is not certainly known. 
Th June 22, 1878. Prisms=Nos. 6, 8,and 4. Dispersion=28°. Re-arranged prisms for space C to D. Definition 
admirable. 10h. 30m. A.M. re-commenced with the a band. ‘ 
Amber. 
a Band: ist and faintest portion— ; 
Ist side 0°3 ne 8714 . 40 42 
Qnddo. | 0°3 = 8°737 Tellurie. 40 434 || @ 
2nd and stronger—lIst side, 07 =o 8°765 : 40 446 
gnddo. | 07 |) = 8-790 Rellarie.: 1/4050 sae 
3rd and strongest—Ist side 115 = 8°815 F 40 466 
~ © “pnddo. ule as — 8858) | 20 2024 st cleae. {40 474) ° 
Sharp line, 2 | 8-943 40 512 
Fine line suspected, . 0°5 ' 8983 40 526 
Clear and sharp line, 2°5 | 9°036 40 546 Iron. 40 546 
A graduated Solar group— 
1st line, thin, 07 1 9°100 40 572 
2nd line, double, A, 1 i 9-147 Titanium. 40 586 7 
Do,} do: 6.) a 9-160 40 593 
3rd, strong, . 2 | 9190 Titanium. 40 602 
| | 4th, stronger, 2 | 9230 Iron. 40 618 
vil 5th, stronger, 3 | 9-262 40 625 Tron. 40 627 
Double line—1st faint, 1 | | 9°354 40 654 15 
2nd stronger, a5 || 4! 9°374 | 40 669 Iron. 40 669 
Very faint double—1st component, Ob {I rT 9-417 40 674 | 45 
and do. 0°5 | 9-426 40 687 : 
Very faint but sharp single line, 1 | 9°483 40 712 
Very faint but sharp double— 
1st component, ile | 9°525 40 726 7 
Qnd do. 1 1g ll 9-545 40 733 
Strong double—1st line, 2 | 9°635 40 765 
2nd line, stronger, + I il 9667 40002 nee 40 774 : 
Suspected line, : : 07 ' 9°735 40 799 
Do. do. 0'7 ' 9°793 40 820» 
Strong fine line, 2 | 9°873 Titanium. 40 848 
Very fine line, . 1 1 9°918 40 863 
Fine line, : 1°5 | 9°945 Titanium. 40 872 
Amber Stronger fine line, 2 | 9980 Tron. 40 883 
Very fine line, . : ; : 5 if I 10°132 40 937 
Fine line, 1.3 ! 10°215 Iron. 40 966 
Strongest line this morning, 
perhapsdouble, .. 4’ Il | 10393 | 41029 Iron. 41028 
Fine line, 3 : ; , uf | 10°459 41 052 
Suspected fine line, : é : : 0°5 | 10°490 41 065 
Do. do. - 0°5 10°553 41 088 
Fine line, 1 j 10°610 Tron. 41 106 
Do. , : F ; é ile | 10°670 Nickel. 41 129 
Do. ; : : - ; , iz | 10°704 Tron. 41 140 
Do. ue | 10°745 41 152 
Do. 1 | 
10°793 41 168 -_ 
