Abstract

Use is made of the enormous inverse chromatic aberration of a zone plate to determine the dominant wave-length, so far as the eye is concerned, of the light from a lamp of definite color temperature transmitted through members of a group of gelatin filters. For representative members of the group this wave-length is compared with the center of gravity of the luminosity curve plotted with the aid of the energy distribution of the lamp, the transmission percentages for the filters and the visibility curve for the normal eye.

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References

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  1. J. L. Soret, Ann. d. Physik und Chemie 156, 99 (1875).
  2. P. G. Nutting, J. O. S. A. 4, 55 (1920).
  3. I. G. Priest, J. O. S. A. 6, 27 (1922).
  4. W. B. Croft, Nature 89, 581 (1912).
  5. The literature of the zone plate appears to be very meager. In addition to the original contribution of Soret and this note by Croft, there are the discussion by R. W. Wood in his Physical Optics and his publication (Phil. Mag. 45, 511 (1898)) of his successful construction of phase reversal zone plates, the possibility of which had been predicted by Lord Rayleigh in his article on Wave Theory in the early editions of the Encyclopaedia Brittanica.

Croft, W. B.

W. B. Croft, Nature 89, 581 (1912).

Nutting, P. G.

P. G. Nutting, J. O. S. A. 4, 55 (1920).

Priest, I. G.

I. G. Priest, J. O. S. A. 6, 27 (1922).

Soret, J. L.

J. L. Soret, Ann. d. Physik und Chemie 156, 99 (1875).

Other (5)

J. L. Soret, Ann. d. Physik und Chemie 156, 99 (1875).

P. G. Nutting, J. O. S. A. 4, 55 (1920).

I. G. Priest, J. O. S. A. 6, 27 (1922).

W. B. Croft, Nature 89, 581 (1912).

The literature of the zone plate appears to be very meager. In addition to the original contribution of Soret and this note by Croft, there are the discussion by R. W. Wood in his Physical Optics and his publication (Phil. Mag. 45, 511 (1898)) of his successful construction of phase reversal zone plates, the possibility of which had been predicted by Lord Rayleigh in his article on Wave Theory in the early editions of the Encyclopaedia Brittanica.

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