THIS little book endeavours to give a comprehen- sive, but not too advanced, treatment of the theory of atomic spectra. The subject is presented so as to avoid the need for much mathematical knowledge ...

This is a preview. Log in through your library . Abstract Spectra of the night sky, taken at Lick Observatory in 1988 and 1989 as byproducts of nebular spectra, show the great increase of light ...

Balloons filled with hydrogen and containing metal salts are ignited. When the balloon explodes, the characteristically colored flame for that metal is seen. This is best performed outside or in a ...

DR. F. A. LINDEMANN (NATURE, January 1) disagrees with the theoretical interpretation of my recent work on X-ray spectra (Phil. Mag., December, 1913). He objects to my statement that the results so ...