Paper, 'On radiant matter spectroscopy: Note on the spectra of erbia' by William Crookes

Description

Crookes writes: 'I have recently succeeded in getting the earth erbia in a sufficiently pure state to allow me to examine its phosphorescent spectrum without the interference which might be produced by the presence of yttria, samaria, holmia, thulia, Yα,or ytterbia. As in the case of yttria the spectrum is best seen when erbic sulphate is heated to redness and submitted to the electric discharge in a high vacuum. The addition of calcic sulphate interferes with the purity of the spectrum. In this respect erbia differs from samaria, as the latter earth seems to require the presence of some other metal to develop its phosphorescent properties.'

Annotations in pencil and ink. Includes one diagram of the spectra of erbia.

Subject: Spectroscopy

Received 7 January 1886. Read 21 January 1886.

A version of this paper was published in volume 40 of the Proceedings of the Royal Society as 'On radiant matter spectroscopy: Note on the spectra of erbia'.

Reference number

PP/8/6

Earliest possible date

1885-1886

Physical description

Ink and graphite pencil on paper

Page extent

2 pages

Format

Printed
Diagram