The Universe has continuously evolved since the Big Bang, transitioning from a diffuse primordial gas to a complex network of ...

The general type, or characteristic type, of this modification is that when the slit of the spectroscope views the sources of light across the lines of magnetic force, each spectral line becomes a ...

WHILST employing a thirty-three plate echelon spectroscope, constructed by Messrs. Adam Hilger for Prof. Schuster, my attention has been directed to a feature of the instrument which needs to be ...