Fascinating. The description of the slanted lines in Jupiter’s spectrum due to rotation is familiar. It was one of the first things I looked at when I built my LHIRES III !
Ken Harrison recently pointed me to an on line version of another interesting historic document
“An Atlas of Representative Stellar Spectra 4870 to 3300” William Huggins published 1899
http://www.e-rara.ch/zut/content/titleinfo/15851436
An interesting parallel to Richard Walkers publication
Cheers
Robin