Paper, 'Further discussion of the sun-spot observations made at South Kensington [London]. A report to the solar physics committee' by J [Joseph] Norman Lockyer

Description

Lockyer writes: 'I have previously reported the results of 700 observations of Sunspot spectra, extending from November, 1879, to August, 1885 [see PP/1/11 and PP/10/7]. The observations have been carried on continuously since the latter date, but, in consequence of the small number of spots which have been visible, the number of additional observations is only a little over 150. Last year very few observations could be made. The eighth hundred of observations dates from August, 1885, to August, 1887, and the first half of the ninth hundred from August, 1887, to February, 1888. As on former occasions, I give Tables A, B, C, showing the numbers of lines of iron, nickel, and titanium respectively which have been recorded amongst the most widened. Table D shows the results in the case of the lines which may at present be described as “unknown lines.”'

Annotations in pencil and ink throughout. Includes one page of diagrams of 'most widened lines in sun-spot spectra'.

Subject: Astronomy / Spectroscopy

Received 27 June 1889. Read 21 November 1889.

A version of this paper was published in volume 46 of the Proceedings of the Royal Society as 'Further discussion of the sun-spot observations made at South Kensington. A report to the solar physics committee. Communicated to the Royal Society at the request of the committee'.

Reference number

PP/14/32

Earliest possible date

1889

Physical description

Ink and graphite pencil on paper

Page extent

25 pages

Format

Manuscript
Diagram