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When the electrode was heated, it would shoot cathode rays across the chamber toward the sphere.

The “cathode rays” in a CRT monitor are just electrons accelerated through a gap between plates with a couple thousand volts between them.

Directed on to the glass walls of the tube – or as researchers discovered, on to sheets of particular minerals – the cathode rays stimulated bright fluorescence.

Lenard, through experimenting with cathode rays,  discovered that the energy of the electron depends on the wavelength of light.

Philipp Lenard, who won a Nobel Prize for his work on cathode rays, wrote a four-­volume treatise on the one true science and called it “German Physics.”