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  1. Hardy, J.O.S.A. and R.S.I. 18, 96 (1929).
    [CrossRef]
  2. Manufactured at the Schenectady plant of the General Electric Company.
  3. This source has recently been replaced by a monoplane filament projection lamp operated directly from the 110-volt d.c. power supply.
  4. This is essentially the same mode of operation that was described in the previous communication.
  5. This optical system may also be used to measure the rotation of the plane of polarization, as by a sugar solution. In this case the sample is inserted between N1and W.
  6. R. D. Nutting, J.O.S.A. 25, 211 (1935).
    [CrossRef]
  7. As this paper is submitted for publication, the integrator has been constructed but has not been attached to the spectrophotometer because of a few changes that must be made in the mechanical system of the spectrophotometer.

1935 (1)

R. D. Nutting, J.O.S.A. 25, 211 (1935).
[CrossRef]

1929 (1)

Hardy, J.O.S.A. and R.S.I. 18, 96 (1929).
[CrossRef]

Hardy,

Hardy, J.O.S.A. and R.S.I. 18, 96 (1929).
[CrossRef]

Nutting, R. D.

R. D. Nutting, J.O.S.A. 25, 211 (1935).
[CrossRef]

J.O.S.A. (1)

R. D. Nutting, J.O.S.A. 25, 211 (1935).
[CrossRef]

J.O.S.A. and R.S.I. (1)

Hardy, J.O.S.A. and R.S.I. 18, 96 (1929).
[CrossRef]

Other (5)

Manufactured at the Schenectady plant of the General Electric Company.

This source has recently been replaced by a monoplane filament projection lamp operated directly from the 110-volt d.c. power supply.

This is essentially the same mode of operation that was described in the previous communication.

This optical system may also be used to measure the rotation of the plane of polarization, as by a sugar solution. In this case the sample is inserted between N1and W.

As this paper is submitted for publication, the integrator has been constructed but has not been attached to the spectrophotometer because of a few changes that must be made in the mechanical system of the spectrophotometer.

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Figures (5)

F. 1
F. 1

Optical system of monochromator.

F. 2
F. 2

Optical system of photometer.

F. 3
F. 3

A Nicol prism A of the same optical efficiency as the modified Rochon prism B drawn to the same scale.

F. 4
F. 4

Photograph of spectrophotometer showing the recording table at the left, the monochromator in the center background, and the photometer and integrating sphere at the extreme right. Reading from left to right, the dials indicate the wave-length in millimicrons, the slit width in millimicrons, and the reflection factor (or transmission factor) in percent.

F. 5
F. 5

A photograph of the integrating attachment with the cover removed.

Tables (1)

Tables Icon

Table I List of 30 selected wave-lengths (millimicrons) for I.C.I. Illuminant C and Standard Observer. (The ten starred ordinates yield results of sufficient precision for materials that are not highly selective.)

Equations (2)

Equations on this page are rendered with MathJax. Learn more.

I = I 1 R 1 + I 2 R 2 = A 2 ( R 1 sin 2 α sin 2 ω t + R 2 cos 2 α cos 2 ω t ) .
I = ( R 1 sin 2 α + R 2 cos 2 α ) ( R 1 sin 2 α R 2 cos 2 α ) cos 2 ω t .