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  1. F. Twyman and C. B. Allsopp, The Practise of Spectrophotometry with Hilger Instruments (London, 1934), second edition, p. 23.
  2. The photometric measurement was made in the laboratory of Physical Chemistry at Harvard University by Dr. Lucy W. Pickett to whom I wish to express my grateful appreciation.
  3. F. Weigert, Optische Methode der Chemie (Leipzig, 1927), p. 213.
  4. W. Finkelnburg, Physik. Zeits. 34, 529 (1933);Zeits. f. Physik 68, 583 (1931).
  5. S. Roessler, Ber. d. Dtsch. Chem. Ges. 59, 2608 (1926).

1933 (1)

W. Finkelnburg, Physik. Zeits. 34, 529 (1933);Zeits. f. Physik 68, 583 (1931).

1926 (1)

S. Roessler, Ber. d. Dtsch. Chem. Ges. 59, 2608 (1926).

Allsopp, C. B.

F. Twyman and C. B. Allsopp, The Practise of Spectrophotometry with Hilger Instruments (London, 1934), second edition, p. 23.

Finkelnburg, W.

W. Finkelnburg, Physik. Zeits. 34, 529 (1933);Zeits. f. Physik 68, 583 (1931).

Roessler, S.

S. Roessler, Ber. d. Dtsch. Chem. Ges. 59, 2608 (1926).

Twyman, F.

F. Twyman and C. B. Allsopp, The Practise of Spectrophotometry with Hilger Instruments (London, 1934), second edition, p. 23.

Weigert, F.

F. Weigert, Optische Methode der Chemie (Leipzig, 1927), p. 213.

Ber. d. Dtsch. Chem. Ges. (1)

S. Roessler, Ber. d. Dtsch. Chem. Ges. 59, 2608 (1926).

Physik. Zeits. (1)

W. Finkelnburg, Physik. Zeits. 34, 529 (1933);Zeits. f. Physik 68, 583 (1931).

Other (3)

F. Twyman and C. B. Allsopp, The Practise of Spectrophotometry with Hilger Instruments (London, 1934), second edition, p. 23.

The photometric measurement was made in the laboratory of Physical Chemistry at Harvard University by Dr. Lucy W. Pickett to whom I wish to express my grateful appreciation.

F. Weigert, Optische Methode der Chemie (Leipzig, 1927), p. 213.

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Figures (2)

Fig. 1
Fig. 1

Photometric curve showing the continuous hydrogen spectrum on an Eastman plate No. 40.

Fig. 2
Fig. 2

Absorption curve of potassium chromate in. water solution taken by the Henri method (x), by photoelectric measurement5 (□), and by the method described in this paper (●).

Equations (1)

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E = 1 / c d log I 0 / I ,