Abstract
During some experiments with various types of vacuum tubes the author was led by the behaviour of one in particular to believe that conditions were possible under which the length of the cathode dark space might be an accurately measurable quantity. This tube is shown in fig. 1. The aluminium disc cathode K is movable and exactly fits the tube containing the anode A. If it is placed to the right in the bulb and a current from a coil passed, tire dark space assumes a highly indefinite and irregular form, such as is indicated. If, however, K is slid to the left, right into the tube containing A, the boundary of the negative glow becomes a very definite plane parallel to the cathode, its distance from the cathode being the same for all positions of the latter so long as it is inside the tube and the current from the coil kept constant.
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