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thick or winged lines

Plate VII. Comparison of the Spectra of Aluminium, Calcium, and the Lenarto Meteorite
(Wave Length 3,930—4,300)
(full bleed image, tidied in lower right)
ex J. Norman Lockyer (1836-1920 *). Studies in Spectrum Analysis. London, 1878
Harvard copy, digitized October 3, 2005

thickening lines...
increasing the number of their lines

as a cloud of dust

1 January 2015

as a cloud of dust; grays; lines; spectra; thickening
J. N. Lockyer