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

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Effect of Carbon Cooling on High-Current Arcs

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Publisher: SMPTE — White Plains, NY, USA
Doc Type: Journal Article
Content Type: Original Research
Abbreviated Title: J SMPE
Volume: 52, No. 4, pp. 407–416
Abstract: The influence of carbon cooling, especially of the positive carbon, on the properties and the mechanism of the high-current carbon arc are studied systematically. An experimental super high-intensity carbon, designed by the National Carbon Company especially for this service, was used. With respect to the technical advantages of carbon cooling (increased arc steadiness, reduced positive-carbon consumption, reduced crater depth, higher possible brightness) our results agree with those presented simultaneously by the National Carbon group. Quantitative relations between current, net arc voltage, net arc wattage, gross arc wattage, crater brightness, carbon consumption, light efficiency, and crater depth for the cooled and the uncooled arc are presented in the form of graphs based on more than 1000 measurements. The considerable reduction of the net arc voltage by cooling the positive carbon indicates an influence of carbon cooling on the arc mechanism itself which is explained, on the basis of the author's anode drop theory, as a consequence of chemical and structural changes in the carbons resulting from the difference in temperatures near the burning end. These changes have been confirmed by X-ray diffraction studies.
Publication Date: 1949-04-01
DOI: 10.5594/J12507
ISSN: Print: 0097-5834
Link: https://doi.org/10.5594/J12507
Author(s): Wolfgang FinkelnburgEngineer Research and Development Laboratories, Fort Belvoir, Virginia
Copyright: © 1949 Society of Motion Picture and Television Engineers, Inc.

Bibliographic Reference(s)

A New Carbon for Increased Light in Studio and Theater Projection [Active]
High-Intensity Projection Arc Lamp [Active]
Recent Developments of Super-High-Intensity Carbon-Arc Lamps [Active]
(3) Heys Hallett C. G. , “Recent developments in carbon arc lamps,” J. Brit. Kinematograph Soc. , vol. 11 , p. 188 ; December, 1947 . EXTERNAL
(5) Finkelnburg W. , “Leuchtdichte, Gesamtstrahlungsdichte und schwarze Temperatur von Hochstromkohlebögen,” Zeit. für Phys. , vol. 113 , pp. 562 – 581 ; 1939 . EXTERNAL
(6) Finkelnburg W. , “The High Current Carbon Are,” Fiat Final Report 1052 (PB-81644, Office Technical Services, U. S. Dept. of Commerce, Washington, D. C.), p. 37 and Fig. 41. EXTERNAL
(7) Pages 25 and 46 of reference 6. EXTERNAL
(8) Page 165 and Fig. 49 of reference 6. EXTERNAL
(9) Pages 106 through 117 of reference 6. EXTERNAL

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Wolfgang Finkelnburg; Effect of Carbon Cooling on High-Current Arcs, Journal of the Society of Motion Picture Engineers ( Volume: 52, Issue: 4, April 1949); SMPTE, 1949. Available at https://doi.org/10.5594/J12507

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Wolfgang Finkelnburg; Effect of Carbon Cooling on High-Current Arcs, Journal of the Society of Motion Picture Engineers ( Volume: 52, Issue: 4, April 1949); SMPTE, 1949. Available at https://doi.org/10.5594/J12507

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<span class="citation">Wolfgang Finkelnburg; <cite>Effect of Carbon Cooling on High-Current 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/J12507" target="_blank" rel="noopener">https://doi.org/10.5594/J12507</a></span>

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Wolfgang Finkelnburg; Effect of Carbon Cooling on High-Current Arcs, Journal of the Society of Motion Picture Engineers ( Volume: 52, Issue: 4, April 1949); SMPTE, 1949
doi: 10.5594/J12507
url: https://doi.org/10.5594/J12507

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<li>
Wolfgang Finkelnburg; <cite id="bib-10-5594-j12507">Effect of Carbon Cooling on High-Current Arcs</cite>, Journal of the Society of Motion Picture Engineers ( Volume: 52, Issue: 4, April 1949); SMPTE, 1949
<span class="doi">10.5594/J12507</span>
</li>