Multi-Anodal Crookes Tube

Laboratory demonstration Crookes tube, with one concave cathode (unlike early Crookes tubes where the cathode was flat), and three short, spherically tipped anodes.

Undated. 20^th Century.

Under high vacuum, the cathode ray beam (the electron beam), would hit the glass wall of the bulb opposite the cathode, irrespective of the position of the activated anode. With a lower vacuum, the electron beam would deviate towards the activated anode, or split into three beams when the three anodes are simultaneously connected.

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