Paper, 'On the spectra of comet a 1890 and the nebula G C 4058' by J [Joseph] Norman Lockyer

Description

Lockyer writes: 'The comet discovered by Mr. Brooks on the 19th of March (a, 1890) has recently been observed at Kensington with the view of testing the sequence of spectra which resulted from my discussion of all the spectroscopic observations of comets which had been made up to the end of 1888. The orbit, however, is such that the comet has only passed through a small range of temperature, and no changes have been observed in its spectrum beyond the gradually increasing brilliancy of the carbon bands relatively to the continuous spectrum. As I pointed out in the paper referred to, the citron band should be most variable, for the reason that the brightest flutings in the spectra of manganese and lead fall near it; but, although this band has been carefully observed on every occasion, it has retained the same wavelength, and was found by direct comparisons to be coincident with the carbon band near λ 564.'

Annotations in pencil and ink.

Subject: Spectroscopy / Astronomy

Received and read 12 June 1890.

A version of this paper was published in volume 48 of the Proceedings of the Royal Society as 'On the spectra of comet a 1890 and the nebula G. C. 4058'.

Reference number

PP/16/22

Earliest possible date

1890

Physical description

Ink and graphite pencil on paper

Page extent

5 pages

Format

Manuscript