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.
Rev., 1904, 18, 370) in the electric arc.
by passing a powerful electric arc discharge through moist air and absorbing the nitric acid formed by lime.
- Independently of the question of the application of external heating, the furnaces used in electrometallurgy may be broadly classified into (i.) arc furnaces, in which the intense heat of the electric arc is utilized, and (ii.) resistance and incandescence furnaces, in which the heat is generated by an electric current overcoming the resistance of an inferior conductor.
The element carbon unites directly with hydrogen to form acetylene when an electric arc is passed between carbon poles in an atmosphere of hydrogen (M.
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 1849 he contributed to the Comptes Rendus a description of an electromagnetic regulator for the electric arc lamp, and, in conjunction with H.
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.
17, except that two slit-like openings of equal length allowed the light to pass, and that the light was that of the electric arc passed through a quartz prism and casting a powerful spectrum on the plate.
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.
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.
blast furnace process or an electric arc process.
electric furnaced alloy steels are produced in electric arc furnaces and scrap rather than molten metal is used as the base material.
electric furnacecan produce over 100,000 tons per annum in two 90 ton electric arc furnaces.
reheat furnaces are used to heat up slabs of steel produced by the blast furnace process or an electric arc process.
star-spangled stage an electric arc through aluminum foil account for correct.
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.
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.
A star-spangled stage an electric arc through aluminum foil account for correct.
The victim may also suffer a fall or an electric arc may set clothing or nearby flammable substances on fire.
The word usage examples above have been gathered from various sources to reflect current and historial usage. They do not represent the opinions of YourDictionary.com.