314 
Colour of the 
Continuous 
Spectrum at 
the Place. 
Glaucous. 
Glaucous. 
PROFESSOR PIAZZ1 SMYTH ON 
aes DATAL Concluded 
Intensity ance by | Micrometer ? Chemical-origin- eee 
Object aaecreds ay a black, fixed i black, or Passa Readin ndit ading. aie Geta trom 7 owe = 3 ve | 
raunhoter Line. ckness ti Grati Nor- ngstrom, PLACE, Sa 
of line. evan. Rey. zal Solar Thalen, &. || British ta, 3 5 
: a 
“Little c,” line repeated, 
hazy and strong; Ist side, 9°345 51 238 
(Strong and clear line in ‘Angstrom)— 4 : 51242 Tron 
2nd side, . 9°380 51 245 
Fine line, 1 al 9°510 Tron. 51 273 
Do. 1 | 9°585 Iron. 51 288 
Do. 1 | 9°610 Tron. 51 293 
Do. 1 | 9°732 Tron. 51 318 
Strong double line : 1st component, . 2 | il 9905 Tron 51 358 
2nd do. C 2 | 9°944 2 51 360 
Faint and unequal double line— 
1st component, i | | 10086 Todi 51 392 
2nd do. 05 |. ' 10°118 i 51 398 
A doubly graduated group of lines— 
1st component, 0°5 f 10°220 ot fa 
2nd do. = 1:0 10°245 1 426 
8rd do. : 1:2 Nee 4 10°260 Tron and ? 51 429 
4th do. 10 || 10-297 | 51 436 
5th do. 05 |, J Ge "342 (51 446 
Fine line, F 1 10°425 Nickel. 51 468 
Strong double line: Ist component, : 3 ; 10516 51 485 Barium and || | 51 482 
2nd do. : 3 10°555 Tron. 51 490 
More trouble with the focus of tele De Changed silver-on-glass mirror, re-adjusted prisms, but found no benefit 
to the faulty definition. Tried simple coer magnifier for quartz eye-piece, but still no benefit ; for still, best focus for 
a thick line is not the best focus for a thin one ; and there seem to be two foci, about 0°7 inch apart on the telescope 
focus-tube ! 
The present amount of Dispersion by prisms 6, 8, and 4=28° from A to H ; and though found very suitable in the 
red and yellow, may be too much in the green and blue, which we are now working in; we shall therefore now tr 
prisms 6 and 8 alone, with Dispersion from A to H=21°. 
Thursday, June 27, 1878. 
9h. 30m. A.M. 
Last double line repeated— 
1st component, 3 8923 = | Bari d || § 51 480 
ond | id; sh II 8-956 |{ 5! 485 | on, ia 490 
Fine line, F 5 - 1 9°006 51 503 
Strong line, 2 9°074 Iron. 51 520 
Faint resolvable band: Ist component, | 1 | 9'165 51 543 
2nd dole: 1 tell 9°180 51 548 
8rd do. i | 9°204 51 554 
Fine line, iP | 9265 51 570 
Stronger line, | 15 | 9°302 51 579 
Strong thick line, 3° | 9°336 Tron. 51 587 
Fine line, aly 9°408 51 606 
Strong double line : 1st component, 3 | I 9°485 51 629 I 51 628 
2nd do. 3 9565 | 51 644 ae 51 644 
Re-set the Prisms. 
Last double line repeated— 
att” | gle Gee | sees | om” Were 
Hazy line, - ‘ : 1°65 9°645 Nickel. 51 650 
Fine line, 15 | 9696 51 663 
Faint hazy band: beginning, . 5 o-7 = 9°813 51 694 
en P : = 9°840 51 700 
Fine line, . és 1 | 9904 51.718 
Ou. i ote aah) 1 | 9-920 51 721 
Strong double: 1st component, 2 | i 9°955 I 51 730 
2nd do. 2 | 9°960 ey 51 733 
