about a stable orbit in a circular accelerator are now referred to as betatron oscillations.

In 1935 Max Steenbeck applied in Germany for a patent on a device that would combine the radial focusing condition of Walton with the vertical focusing used in Breit and Tuve's machine. He later claimed to have built a working machine, but this claim was disputed.

The first team unequivocally acknowledged to have built a working betatron was led by Donald

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