Electricians' operating and testing manual; by Horstmann Henry C

Author:Horstmann, Henry C. [from old catalog] & Tousley, Victor Hugo, 1875- [from old catalog] joint author
Language: eng
Format: epub
Tags: Electrical engineering, Electric testing
Publisher: Chicago, F. H. Drake & co
Published: 1910-03-25T05:00:00+00:00

of metal running through the length of the carbon rod. This scheme is made use of in the flaming arcs where long carbons of small cross section are used.

Cored carbons can be burned at a lower voltage and, if used in conjunction with solid negative carbons will, on direct current, give a very steady arc. The soft core being in the center of the carbon allows that part of the carbon to burn away faster and thus maintain the crater and the arc in one position. Metal electrodes are used in some forms of lamps, various advantages being claimed for them. They always form the negative electrode for, if used on the positive side they are very rapidly consumed.

"While there is no definite relation between the size of the carbon and the current, it is evident that there are conditions which must limit us from either extreme. If a small carbon were used with a large current, considerable hissing would result, and the carbon w r ould be rapidly consumed, while with a large carbon and a small current the arc would rotate around the carbon and the light would be very unsteady. The carbon points would not be heated to any great extent and the efficiency would be low. The size of the carbon rods and an outline of the general practice is given in the following table:

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