[ 6!’5 ] 
XIV. On the Photographic Spect ra of some of the Brighter Stars. 
By J. Norman Lockyer, F.R.S, 
Received November 3,—Read December 8, 1892. 
[Plates 26-30.] 
Contents. 
Page 
I.—Introduction.677 
II.—Methods of work.678 
(1) The objective prisms .678 
The clock rate.680 
Electrical control.681 
(2) The SO-uich Bejlector .682 
. The slipping plate.683 
The slit spectroscopes.683 
(3) Enlargement of the Negatives . 683 
III. —List of Spectra photographed.685 
(1) Stars photographed with instrument A .685 
(2) Stars photographed with instrument B .686 
(3) Stars photographed with instrument G . 686 
(4) Stars photographed with instrument D .687 
(5) Spectra photographed with instrument E .688 
IV. —Tabulation of Similar Spectra. 688 
(1) Table A .689 
(2) Table B . 7 690 
(3) Table G .691 
(4) Table D .691 
V.—Discussion of Stars in Table A.691 
(1) Sub-division a . 692 
Characteristics of the spectra.692 
Table of wave-lengths.693 
The spectrum of 7 Orionis.694 
Sequence of spectra in these stars.695 
(2) Sub-division (3 .696 
Characteristics of the spectra.696 
Arrangement in order of differences.696 
(3) Sub-division ..697 
Characteristics of the spectra.697 
Further sub-division.697 
24.10.93. 
4 R 2 
