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Journal of the Society of Motion Picture Engineers ( Volume: 52, Issue: 4, April 1949)
[ACTIVE]

Optimum Performance of High-Brightness Carbon Arcs

Metadata

Publisher
SMPTE — White Plains, NY, USA
Doc Type
Journal Article
Content Type
Original Research
Abbreviated Title
J SMPE
Volume
52, No. 4, pp. 395–406
Abstract
The effects of positive-crater cooling are described, and a suitable apparatus for this purpose is illustrated. The combination of specially made high-brightness carbons with water-cooled operation permits the use of higher currents without unsteadiness, and so gives a higher brightness than has been achieved in conventional air-cooled operation. This is attributed to the fact that effective cooling of the positive carbon removes energy which would otherwise be dissipated in turbulent volatilization, so that a higher current density can be achieved in the light-producing gas ball before overload turbulence occurs. A considerable part of the more efficient crater cooling is attributable to the carbons themselves, since they will operate without water cooling at higher currents and brightnesses than other types of equal size. Within the limit of satisfactory air-cooled operation with a given carbon, efficient water cooling always reduced the light produced at a given current; the ability to operate with higher brightness at higher currents was thus gained at the expense of a lower current efficiency. Carbons designed for efficient air-cooled operation gave no better result with water cooling; the current efficiency was sacrificed with no gain in maximum brightness.
Publication Date
1949-04-01
DOI
10.5594/J12506
ISSN
Print: 0097-5834
Link
https://doi.org/10.5594/J12506
Author(s)
M. T. JonesNational Carbon Company, Cleveland, Ohio
F. T. BowditchNational Carbon Company, Cleveland, Ohio
Copyright
© 1949 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

  • Light Generation by the High-Intensity Carbon ARC [Active]
  • A New Carbon for Increased Light in Studio and Theater Projection [Active]
  • (3) Finkelnburg W. , “The influence of carbon cooling on the high-current carbon are and its mechanism,” J. Soc. Mot. Pict. Eng. , this issue, pp. 407 – 417 . EXTERNAL
  • (4) Finkelnburg W. , “The High-Current Carbon Are,” Field Information Agency, Technical, Office of Military Government for Germany (US), Final Report 1052. (Office of Technical Services P.B. No. 81644.) Review published J. Soc. Mot. Pict. Eng. , vol. 52 , pp. 112 – 113 ; January, 1949 . EXTERNAL
  • (5) Heys Hallett C. G. , “Recent developments in carbon arc lamps,” J. Brit. Kinematograph Soc. , vol. 11 , p. 188 ; December, 1947 . EXTERNAL
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M. T. Jones and F. T. Bowditch; Optimum Performance of High-Brightness Carbon Arcs, Journal of the Society of Motion Picture Engineers ( Volume: 52, Issue: 4, April 1949); SMPTE, 1949. Available at https://doi.org/10.5594/J12506
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M. T. Jones and F. T. Bowditch; Optimum Performance of High-Brightness Carbon Arcs, Journal of the Society of Motion Picture Engineers ( Volume: 52, Issue: 4, April 1949); SMPTE, 1949. Available at https://doi.org/10.5594/J12506

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M. T. Jones and F. T. Bowditch; Optimum Performance of High-Brightness Carbon Arcs, Journal of the Society of Motion Picture Engineers ( Volume: 52, Issue: 4, April 1949); SMPTE, 1949. Available at https://doi.org/10.5594/J12506
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<span class="citation">M. T. Jones and F. T. Bowditch; <cite>Optimum Performance of High-Brightness Carbon Arcs</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 52, Issue: 4, April 1949); SMPTE, 1949. Available at <a href="https://doi.org/10.5594/J12506" target="_blank" rel="noopener">https://doi.org/10.5594/J12506</a></span>

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M. T. Jones and F. T. Bowditch; Optimum Performance of High-Brightness Carbon Arcs, Journal of the Society of Motion Picture Engineers ( Volume: 52, Issue: 4, April 1949); SMPTE, 1949
doi: 10.5594/J12506
url: https://doi.org/10.5594/J12506
Snippet:
<li>
M. T. Jones and F. T. Bowditch; <cite id="bib-10-5594-j12506">Optimum Performance of High-Brightness Carbon Arcs</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 52, Issue: 4, April 1949); SMPTE, 1949
<span class="doi">10.5594/J12506</span>
</li>

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