This effect is perhaps best witnessed on viewing a line spectrum such as that of the mercury arc, focused upon a ground glass.
Indeed the distortion would be even greater than with the mercury arc, whose objectionable green hue is so well known.
A term usually used in connection with electrolytic apparatus, mercury arc rectifiers, and electric arcs.
The mercury arc rectifier is a device for changing an alternating current into a direct current.
Further experimentation with the mercury arc led to the other two inventions, the converter and the interrupter.