A Photoelectric Photometer Employing an Electron Counting Technique

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Abstract
The chief instrumental problem in photoelectric stellar photometry is that of measuring the minute photoelectric currents. A method of performing this measurement by counting the electrons into which the current is resolvable is discussed; an apparatus for achieving the electron counting is described and some preliminary observational results obtained with an unselected 931–A tube are quoted, which indicate that with a 15-inch telescope it should be possible to make photometric measures down to 12 m .

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