Hajossy et al (1999 J. Phys. D: Appl. Phys. 32 1058) alleged that the break of a short circuit is preceded by the ignition of an arc because they estimated the relative field strength to be high enough for this to occur. This assertion has proven inconsistent with measured data. In particular, the typical sudden change from progressively rising to sharply dropping voltage contrasts with the alleged gradual commutation, but rather points to a detonation across the isthmus. Concerning the confinement of metal vapour due to inertia, the comment refers to Hess (1991 J. Phys. D: Appl. Phys. 24 36-40). There are several substantiated reasons why the minimal diameter of the bridge and also the voltage, required for a bypassing ignition, are actually larger than the values estimated by Hajossy et al, and why the bridge does not simply vanish. Somewhat misleading observations are blamed for the fallacies. The established wire explosion model of re-ignition is certainly valid, even in general. For that reason, there is no hope that the alleged premature ignition could be used for avoidance of the spatter-causing explosion.
Experience concerning measurement and interpretation of a special crackle sound which relates to the quality of so-called short arc welding is summarized. There are salient elements in it, which sound different when time is reversed. Other observations also gave rise to put into question the adequacy of traditional, purely spectral processing of acoustical signals. Further evidence has been collected in order to substantiate general needs for a better understanding of how audition might really work, and to justify the search for an approach that could overcome the well-known imperfections of spectrograms. Considerations start with interpretation of data given on response of basilar membrane to clicks by Recio et al. (1998) and on branched, more apical recorded click latencies in Cai’s (1992) thesis. Gammachirp-like behavior of basilar membrane has been considered a superposition of coupled oscillations. The branched latencies were found to fit a conjectured exact relationship to 1/CF surprisingly well. It does not result from the velocity of the traveling wave, but the way around; the latter is merely an epiphenomenon. These findings back an idea that latencies provide an accurate second coding, in addition to place. So, the cochlea itself may act as a delay line, being requisite for autocorrelation-based models of temporal perception.
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