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  1. Hartridge. Phil. Mag., July, 1923.
  2. If d is the reduced diameter of the objective necessary to show diffraction rings, then this is the value to be used instead of a. For the utilization of such a diaphragm for measuring the "seeing" see Yearbook Carnegie Inst., p. 245, 1922.
  3. It may be noted that in the measurement of the standard meter in light-waves the order of accuracy in the relative values of the three radiations of cadmium vapor [equation]=5×10-7. With [equation] and [equation] both of the order of 5×10-6 the calculated value is 3×10-7.

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Hartridge. Phil. Mag., July, 1923.

If d is the reduced diameter of the objective necessary to show diffraction rings, then this is the value to be used instead of a. For the utilization of such a diaphragm for measuring the "seeing" see Yearbook Carnegie Inst., p. 245, 1922.

It may be noted that in the measurement of the standard meter in light-waves the order of accuracy in the relative values of the three radiations of cadmium vapor [equation]=5×10-7. With [equation] and [equation] both of the order of 5×10-6 the calculated value is 3×10-7.

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