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  1. The optical parts for this eyepiece were made according to the writer’s specifications by the Bausch and Lomb Optical Co., of Rochester, N. Y., and have been found, on test, to be entirely satisfactory.

Other (1)

The optical parts for this eyepiece were made according to the writer’s specifications by the Bausch and Lomb Optical Co., of Rochester, N. Y., and have been found, on test, to be entirely satisfactory.

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Figures (1)

Fig. 1
Fig. 1

The upper part of this diagram presents the optical arrangement of the photometer. A negative lens, L1, is cemented to the front side of the Wollaston prism, W, and a positive lens, L2, to the opposite side. The biprism A is movable along the axis; the second biprism B is located in the image plane. The Thompson prism P is rotatable about the axis; C is the low power eyepiece lens, and E, the narrow exit pupil of the instrument.

Tables (1)

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Table 1 Angles included with the axis by the ordinary and extraordinary waves (C, D, and F spectral lines) after passage through the Wollaston prism (iω, i), the biprism A (iω, i), and the biprism B (iω, i).