I don't know if anyone notice this or not, but in 1923 arc is a DC continuous electric stream and spark is an AC intermittent electric jump. Arc voltage range is bellow spark voltage range. When the gap heat up the arc voltage range diminish and eventually produce only spark or none at all.
From Charles Proteus Steinmetz - Theory and calculation of electrical circuit.
For modern definition:
http://orca.phys.uvic.ca/~tatum/stellatm/atm7.pdf
If you don't limit voltage you will get spark. And I think this is not what supposed to be done.
Disrupting spark you will get nothing, disrupting arc will get you radiant. Search for discharge anomalous behaviour (where scientist can't explain it because they don't believe in aether existence). While the input is DC, and the arc is DC, the resulting output (whatever it is) is AC.
Other than vacuum, argon can improve arc (Correa's patent).
For book explaining the condition or voltage-current-length combination required for arc:
Internet Archive: Free Download: Electric arc phenomena
From Charles Proteus Steinmetz - Theory and calculation of electrical circuit.
For modern definition:
http://orca.phys.uvic.ca/~tatum/stellatm/atm7.pdf
In the early days of spectroscopy, in addition to flames and discharge tubes, common spectroscopic sources included arcs and sparks. In an arc, two electrodes with a hundred or so volts across them are touched, and then drawn apart, and an arc forms. In a spark, the potential difference across the electrodes is some thousands of volts, and it is not necessary to touch the electrodes together; rather, the electrical insulation of the air breaks down and a spark flies from one electrode to the other. It was noticed that the arc spectrum was usually very different from the spark spectrum, the former often being referred to as the "first" spectrum and the latter as the "second" spectrum. If the electrodes were, for example, of carbon, the arc or first spectrum would be denoted by C I and the spark or second spectrum by C II. It has long been known now that the "first" spectrum is mostly that of the neutral atom, and the "second" spectrum mostly that of the singly-charged ion. Since the atom and the ion have different electronic structures, the two spectra are very different. Today, we use the symbols C I , or Fe I, or Zr I , etc., to denote the spectrum of the neutral atom, regardless of the source, and C II , C III , C IV , etc., to denote the spectra of the singly-, doubly- triply-ionized atoms, C+ , C++ , C+++ , etc. There are 4278 possible spectra of the first 92 elements to investigate, and many more if one adds the transuranic elements, so there is no want of spectra to study.
Disrupting spark you will get nothing, disrupting arc will get you radiant. Search for discharge anomalous behaviour (where scientist can't explain it because they don't believe in aether existence). While the input is DC, and the arc is DC, the resulting output (whatever it is) is AC.
Other than vacuum, argon can improve arc (Correa's patent).
For book explaining the condition or voltage-current-length combination required for arc:
Internet Archive: Free Download: Electric arc phenomena
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