Sidereal chromatics; being a re-print, with additions, from the "Bedford cycle of celestial objects", and its "Hartwell continuation", on the colours of multiple stars (1864)
Smyth, W. H. (William Henry), 1788-1865 · London, Printed for private circulation by J. B. Nichols and Sons · leaf 2
Double stars · Stars
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.