. 
‘ | a Bey ; 
W. Gibbs on a normal Map of the Solar Spectrum. = 5 
Tasie II—(continued.) Ps 
no o ™ © a o au oS 
Gs| eg | 2 | Se] e2 | 8 | asl se | el Se] fe | 2 
| a |" |e |e | 9 |e |e a lle 2 14 
4 1100 | 576:20] |. 0°85 || 10 | 492°05 | 70 | 455-65} . 
; | aya8 syd is Fes oBo|| 20 | 491-25 pr Bo | 45480 | 28? cS 
3 | 573-35 1-35 bo eet 0-75 || 30 | 4 10-50 0-90 | <9 454-05 rsd 
4 0 | 572-00 U5 |0°75|| 40 | 48960 | 6.2, ||2500 | 453-30] 9.55 
4 4o | 570°65 FD 75 50 | 488-80 éte 10 | 45255 ee 
| 50 | 569°30 | roe eee aoe 0-70 4 8-05 | 6.45 || 20 451°80 | «. 
6a |Sbees |" 5 ae Sor 0-75 || 70 | 487-30 rbd jo | 451-10 nae 
70 | 566-80 | 173° || 3° | 31972 | 0-70 || 80 | 486-46 | 9 9¢ || 40 | 450-40] 565 
80 | 565-50 a 0}; Jo Pb o-70 | 485-60 ons 0 | 449°75 0-70 
| 564-20 ee 2 : ee 0°70 |j2100 | 484-85 ons 449°05 | 0.65 | * 
1200 | Sago . 5 © |517°65| 95 || 16 | 484-03 1:26 || 7° | 448-40} o-26 
561-65 |? - 1625 0-75 20 | 4 BIT 4 80 | 447°70 me 
20 560-45 | 12° bes raigh 0-70 30 | 481-60 AE g° | 447-05 oth 
30 559°25 | * a wees: ae 0°70 |} 40 | 481-00 ond it 446° 40 o65 
do | 558-05 | "22 1479 | 95 || 50 | 48026 |°°'74 1 10 | 445-75 | 0-65 
50. | 556-80 | 1°32? {770° a 0701] 60. 47929 | 9.97 || 20 "10 | 6.65 
60 | 555-60 |e oe eo 1 272 || 7° | 47800 | 1.73 ]] 30 | 444-45 | og 
70 | 554-50 en tid deat ene ji ee | 476°87 61 40 | 443-75 ns 
Bo | 853-30 | 122|| 30 | 51185 |g 75 (476-26 | 034|| 50 | 443-05 0-60 ' 
go | 552-2 1:05]| 40 | Strr 0:70 ||2200 47592 sen 442-45 o- 
1300 | 551-1 tio 20 pide o:80 10 | 475-32 oe 7o | 440-75 ee me 
10 | 550-36 ee 60 ied 0-:70}} 20 | 47450 ois 80 | 441-15 | Ce, 
20 a a ‘ mt 0-70 30 | 473-70 é go | 440-55 oto 
30 | 547-47 | 1.66 = 4 5 0:70 || 40 | 472°80 ya 8 2700 ped ote 
40 | 546-41 | 1.37 [1890 | 506 Bo | 222 || 5° |472°00| o95|| 10 | 43935 | O55 
Bo | 45-10| 7.7) 06-15 0°65 |} 60 | 471-15 85; 2° 438 okt 
Go | 544-00 | 5.83 || 55 | Bo540|2°9|| 70 | 47030 | Faq || 30 | 438-25) C5 
70 | 543-17 | 5.93 30 ) 80 0-70 || 80.) 46950} 6g, || 40 | 43770) 6.65 
Bo | 542-24 | 2.9 re - ° | o-70 468-70 | 5.45 || 50 43710 60 
90 | 540-80 | 598] 8 | 353.45 | 005/230 | 467-95] 5.75 || 60 | 436-50 | 5 go 
1400 | 540-10 | aes Pi ‘ = o-70 To | 407-20 ee 70 435-90 660 
10 | 538-83 | 7.38 || oo | Bon 5 |222|| 20 466-45 | OZe || 80 | 435-30 | Ose 
20 | 537-77 a be 40, | 0°85 || 30 | 465-80 | Cee || go 75|o ae 
30 | 536 43) 7 4 “a 0:50 |) 4o | 465-15 365 2800 | 434-20 pai 
40 | 535-23 | 5.80 Sonn | 0°60 || 50 | 46450 | See || 10 | 433.60 | 2° 
So 1534-43 | 0 a3 ll so | sonrss | Oe | 46385 | O55 || 20 | 433-00] Ore 
60 | 533-60 ° 10 | 49999 | 0.65|| 70 | 463-25 | O20 l| 30 | 432-45 | 22 
70 | 532-66. be = 498 5 {0°65 |) 80 | 462°65] 8 60|| 40 | 431-90] 0 a0 
80 | 531-50 | 1} aes 0-65 || go | 462-05 055 || 50 | 431 ee 
90 |53050| 502) 2° 497.8? | 0-75 ||2d00 | 461°50 | ©? ba! 
1500 | 529-55 | ae 6 0°70 || 10 | 460°95 | | 5 || 70 | 430-10 
10 | 528-60 | 99; © | 49610 | 6.70 || 20 | 460-00 | °F 
20 27-65 | 09° bs oe 0°85 || 30 | 45910 | © 5 
30 |526-75 | O99 || 5 picker 0-801} do | 458-25 | © 
lo | 525» ‘ 457-35 
f [E58 OB ke |Bess[ee | S| Srs 288], | 
To find the wave length of any line in Kirchhoff’s table; or 
upon his chart, from a III, it is only necessary to employ the — 
simple formula = — Gy (x — #) ad 
in which 2’ represents ‘i wave length sought and *’ the-optiee ce 
ponding line upon Kirchhoff’s scale; 4.the wave length of the 
next lower line * in Table III, and Al the ot differ. 
ence also given in the table. Tt is not ne n any case to — 
employ second differences. The following table will serve to 
3 
ie 
i 
E 
ee 
