Diagrams, spectra by William Huggins and Margaret Lindsay Huggins One page of seven spectrum diagrams, labelled numbers 1-7. Diagrams 1-3 show the positions of the bright bands in stars No. 3956, No. 4013 and No. 3956 relative to the blue band of a Bunsen flame, according to [Hermann Carl] Vogel's measurements. Diagrams 4-7 show the same for stars No. 4001, No. 4013, No. 3956 and No. 3821 according to the Huggins' measurements. Subject: Astronomy / Spectroscopy Prints of these diagrams were published in volume 49 of the Proceedings of the Royal Society alongside the paper 'On Wolf and Rayet's bright-line stars in Cygnus'. 1890