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Erratum: The Attenuation of Spherical Shock Waves in Air



5 An account of previous work on the "short arc" is to be found in R. Holm's Electric Contacts (Almquist and Wikse\ls, 1946). 6~ volts +-2 XIO-7 sec.--> FIG. 2. "Short arc" occurring between gold contacts breaking 6 volts. The contact circuit contained 10 ohms and 1.0 p,H inductance. The oscilloscope circuit contained 800 ohms. Magnification 6X. conditions a large part of contact erosion IS associated with this molten bridge. 6 Figure 2 is representative of a number of photographs obtained under similar conditions with both gold and platinum contacts. It is concluded that the "short arc" will accompany contact separation if the maximum voltage of the transient can reach a value of about 10 volts and a current larger than the minimum current necessary to support the arc can flow. The approximate energy dissipated in the arc is simply calculated, and under the conditions of Fig. 2 it is about 0.5 Li o2, io being the current flowing before the contacts begin to separate. Studies 7 of a "short arc" occurring between making contacts (in which stored capacitative energy is discharged) indicates that considerable energy is dissipated on the positive electrode. Under typical "bridge erosion" conditions the



Journal of Applied PhysicsAmerican Institute of Physics

Published: Dec 1, 1948

DOI: 10.1063/1.1715031

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