Electric arc sentence example
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.
It appears, however, to depend upon the fact that an electric arc is not like a solid conductor.
Increase in the voltage acting upon a solid conductor increases the current through it, but in the case of the electric arc an increase in current is accompanied by a fall in the difference of potential of the carbons, within certain limits, and the arc has therefore been said to possess a negative resistance.'
The electric arc is formed between cooled copper (positive) and carbon (negative) electrodes in an atmosphere of hydrogen or coal-gas.
For the illumination of large stations by night electric arc lamps are frequently employed, but some authorities favour high-pressure incandescent gas-lighting.Advertisement
Especially when large gratings are employed do we find that the electric arc alone seems sufficient to give vibrations of the requisite power.
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.
In July 1808 Davy laid a request before the managers of the Royal Institution that they would set on foot a subscription for the purchase of a specially large voltaic battery; as a result he was provided with one of 2000 pairs of plates, and the first experiment performed with it was the production of the electric arc light between carbon poles.
This invention in conjunction with an alternating current dynamo provided a new and simple form of electric arc lighting.
The practical effect of the bactericidal action of solar light is the destruction of enormous quantities of germs in rivers, the atmosphere and other exposed situations, and experiments have shown that it is especially the pathogenic bacteria - anthrax, typhoid, &c. - which thus succumb to lightaction; the discovery that the electric arc is very rich in bactericidal rays led to the hope that it could be used for disinfecting purposes in hospitals, but mechanical difficulties intervene.Advertisement
Bredig's process consists in passing an electric arc between silver electrodes under water, when a brown solution is obtained.
His method was to sift out the long dark waves which are associated with the short visible waves constituting the light of the sun or of the electric arc and to concentrate the former to a focus.
According to Tyndall, 9 0% of the radiation from the electric arc is non-luminous.
Both carbon and alloy steels are produced in electric arc furnaces and scrap rather than molten metal is used as the base material.
The victim may also suffer a fall or an electric arc may set clothing or nearby flammable substances on fire.Advertisement