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What all are the experiments do in the discharge tube by different scientist !

A crooker tube is an easily experiment electrical discharge tube, with partial vacuum invented by William crooker, in which cathode rays, streams of electrons were discovered.

It consists of a partially evacuated glass container with two metal electrodes, the cathode and the anode one at either end. When a high voltage is applied between the electrodes, cathode rays are projected in straight lines from the cathode.

It was used by crooker, Johann Hittorf, Julius plucker, Eugen Goldstein, Heinrich Hertz, Philip Lenard and others to discover the properties of cathode rays, culminating in J.J Thomas identification of cathode rays as negatively charged particles, named electrons.

Rontgen discovered X- rays using the crookers tube in 1895.

Maltese cross – Julius Plucker

Deflection by electric fields – Heinrich Hertz.

Anode ray discovery – Goldstein

Doppler shift – Goldstein.