OF ARTS AND SCIENCIS. 



241 



TABLE I. — Continued. 



No. 



Da to 



8 

 9 



10 

 11 



12 

 13 

 14 



15 



1879. 

 Auk. la 



Sept. 15 

 Sept. 17 



Sept. 17 

 Sept. 22 



Sept. 24 

 Sept. 24 

 Sept. 25 



Sept. 26 



16 



17 



Scpt. 27 



18 



19 



20 



Sept. 27 



Sept. 27 



Oct. 4 



Oct. 4 



Objuct. 



Time. 



anil 

 Jupiier 



Jupiter 



end 

 a Lyra; 

 Jupiter 

 a Lyrse 



Jupiter 

 a Lyra' 



a Lyra! 

 Jupiter 



a Lyrje 

 Jupiter 



Mars 



a Aurigse 

 a LyrsB 

 Moon 



a I<yrse 

 Mooii 



a Lyrffi 

 Moon 



Jupiter 

 Moon 



Moon 



Mars 

 a Lyrae 



Jupiter 

 Jupiter 



llh. 30m. 



to 

 131i. 15m. 



9h. 55m. 



to 

 lOh. 55m 



llh. 21m 



to 



12h. 



81i. 5m. 



to 



!)h. 20m. 



lOh. 25m. 



L-xpos. 1 Siit. 



4Tm. 



47in. 



45 m. 



43m. 

 30m. 

 49m. 



4am. 

 45m. 



4nni. 

 50m. 



54m. 

 30m. 



55m. 



48m. 



li;3m. 



30m. 



45m. 

 10m. 



47m. 

 5m. 



a.\urigse llh. 43m, 



50m. 



10m. 



10m. 



25m. 

 45in. 



25m. 

 25m. 

 50m. 



.010 



.010 

 .011 



.011 

 .015 

 .015 



.015 

 .015 



015 

 .015 



.015 

 .015 



.015 



.015 

 .015 

 .015 



.015 

 .015 



.015 

 .015 



lust. 



.005 

 .005 



.005 



.005 

 .010 



.010 

 .010 

 .010 



12-in. 



12in. 



12in. 



12-in 

 12-iii 

 12-iu. 



12in 



12-ia. 



12-in. 

 12in. 



12-in. 

 12-iu. 



12-in. 



12-in 

 12-in. 

 12-in 



12in. 

 12-«n 



Uiiuiarks. 



12-In. 

 12-in. 



12-in. 

 12in 



12-in. 



12-in 

 12iii 



ILi J to reverse tlie telescope for She ex- 

 posure of o Lyra', and, not having 

 ailjusted the finj;or \.<'.l I'li the slit, the 

 i\vi> spectra overlajiped too niueli. 



In thi.s i>hotogruph the Ulcscope was 

 fotused for the G rays cu the sUt. 



In tliis pirtu!-e the II rays upre focused 

 on the slit, liut us the spectra did not 

 extend as fir into the violet as those 

 taken before, tlie focus of tlio 12 inch 

 telescope was change 1 to bting the O 

 rays in focus on the slit, look another 

 photograph. In lliis both spif tra were 

 stronger, but a L\rse did not extend 

 to. H. 



The atmosphere was niL^ty, and the 

 moon looked very yellow. The spec- 

 trum of a Lyra^ is very faint, and ex- 

 tends only from F to G. 



The night was quite clear, but neitlier 

 spectrum extended above H. G was 

 still focused on the slit. 



M.irs and a Auriga' were at about the 

 same altitude. The two spectra are- 

 very nuich alike. 



The night was dear. Gare a Lyra^ two 

 runs of the clock to try to get its 

 spectrum above K. The nio©ii"s spec- 

 trum extends a long distante above II, 

 but tlie spectrum of a Lyroe only to h. 

 The moon was fiver-esposed. 



The ntghc was quite clear. The moon's 

 spectrum is very strong, but there is 

 no picturf of a Lyr». In this plioto- 

 grnph,used anew gelatine plate, think- 

 ing the old onr^ might have deterio- 

 rated, but found it of no advanteige. 

 When a star is adjusted on the slit so 

 that tlie green end of the spectrum is 

 the brightest, the violet loses bright- 

 ness somewliat, and fice fertM. 



Examined the spectroscope with sun- 

 light and readjusted it, so as to be sure 

 the violet end (if the spectrum was not 

 cut off by the prisms or lenses. 



This evening went to the Observatory 

 early enough tu photograph the spec- 

 trum of a Lyra', when the star was only 

 a little past the meridian. Readjusting 

 the spectroscope improved it The 

 spectra are strong, aud extend above 

 li. The G rays were focused on the 

 slit. 



Jupiter in this photograph was about 

 4-5-' high, and the Moon about 50"^. 

 The exijosure was made upon the 

 meridian. During the latter part of 

 the moon's exposure, the lens dewed 

 over, therrfore one cfiuld not judge of 

 the n-lative briirhtness of the two. II 

 rays were focused on the slit. 



Got no impression of Mars, for the lens 

 dewed over at the end of 25 m.,and the 

 sky clouded 



A good picture. 



12in 



12 in. U rays focused on the slit. Spectrum 

 12 in. I of a Aurigae was faint. 



VOL. XIX. (n. S. .\I.) 



IG 



