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  1. See Liebenthal “Praktische Photometrie,” p. 206.
  2. Jnl. Franklin Institute, p. 641; May, 1922.
  3. Described at the 1921 meeting of the Optical Society of America.

1922 (1)

Jnl. Franklin Institute, p. 641; May, 1922.

Liebenthal,

See Liebenthal “Praktische Photometrie,” p. 206.

Jnl. Franklin Institute (1)

Jnl. Franklin Institute, p. 641; May, 1922.

Other (2)

Described at the 1921 meeting of the Optical Society of America.

See Liebenthal “Praktische Photometrie,” p. 206.

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Fig. 3

Disc with covers in place.