His wife, Mrs Hertha Ayrton, whom he married in 1885, assisted him in his researches, and became known for her scientific work on the electric arc and other subjects.
The electric arc is formed between cooled copper (positive) and carbon (negative) electrodes in an atmosphere of hydrogen or coal-gas.
It appears, however, to depend upon the fact that an electric arc is not like a solid conductor.
In order to produce electric oscillations in the system, the first or alternating current transformer must charge the condenser connected to its secondary terminals, but must not produce a permanent electric arc between the balls.
Foucault devoted attention to the invention of automatic apparatus for the production of Davy's electric arc (see Lighting: Electric), and these appliances in conjunction with magneto-electric machines were soon employed in lighthouse work.
By passing a powerful electric arc discharge through moist air and absorbing the nitric acid formed by lime.
Brush, in the United States, produced another efficient form of dynamo and electric arc lamp suitable for working in series (see Lighting: Electric), and these inventions of Brush and Jablochkov inaugurated commercial arc lighting.
In 1849 he contributed to the Comptes Rendus a description of an electromagnetic regulator for the electric arc lamp, and, in conjunction with H.
This invention in conjunction with an alternating current dynamo provided a new and simple form of electric arc lighting.
For the illumination of large stations by night electric arc lamps are frequently employed, but some authorities favour high-pressure incandescent gas-lighting.