Abstract

SYNOPSIS

A study of the errors in spherical photometry due to the presence of the lamps and screens in the Ulbricht sphere led to the development of a fixed convex mirror to be used in place of the two larger screens. A further development of the theory of interference within the instrument led to the adoption of a hemisphere in place of the complete sphere. It is shown how the instrument is calibrated and used for the testing of

The various accessories that go with the instrument are described and illustrated

© 1922 Optical Society of America

The Integrating Factor of the Photometric Sphere

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The Gloss Characteristics of Photographic Papers*

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Measurement of the Color Temperature of the More Efficient Artificial Light Sources by the Method of Rotatory Dispersion*

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Recent Measurements of Stellar and Planetary Radiation1

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