Wehnelt Interrupter

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IN a previous communication to this journal (p. 438), I pointed out various methods of controlling the Wehnelt interrupter with a view to preventing the destruction of Crookes' tubes. Since then I have made a series of observations which confirm what was previously stated. The principle upon which the experiments were conducted was to keep all the factors constant with one exception, the amperage, voltage, results upon the fluorescent screen and photographic plate being carefully noted and registered by means of an X-ray meter. In one set of experiments the voltage was varied, in another the density of the solution, in the third, the size of the platinum, in the fourth the self-induction of the primary coil. By varying any of these, or by a combination specially suited for different purposes, complete control of the Wehnelt was obtained in the way of greater or less fluorescence, actinic power, and steadiness of the screen. Briefly stated, it was found that all these effects decreased as we lowered the voltage, the self-induction of the primary, the density of. the electrolyte, and the size of the platinum.

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MACINTYRE, J. Wehnelt Interrupter. Nature 60, 8 (1899) doi:10.1038/060008b0

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