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References

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  1. J.O.S.A., & R.S.I.,  18, pp. 123–126; 1929.
    [Crossref]

1929 (1)

J.O.S.A., & R.S.I.,  18, pp. 123–126; 1929.
[Crossref]

J.O.S.A., & R.S.I. (1)

J.O.S.A., & R.S.I.,  18, pp. 123–126; 1929.
[Crossref]

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Figures (3)

Fig. 2
Fig. 2

Mercury arc—through 1 mm pyrex. Mercury arc—through thin pyrex window. Mercury arc—Cooper-Hewitt quartz arc. Exposure time—5 seconds.

Fig. 3
Fig. 3

A—Zinc-aluminum spark. B—Zinc-aluminum spark through 1 mm fused quartz. C—Zinc-aluminum spark through .001 cm pyrex window. Exposure—30 seconds.