ABSTRACT
M Stanley Livingston's 4-inch cyclotron, with a stronger magnet, produced 80-kV protons on 2 January 1931. Exactly one week later, Ernest O Lawrence set the wheels in motion for building a bigger machine, with one million-volt protons the goal. Lawrence and Livingston substituted some parallel slits, and the collected current improved somewhat. And when Lawrence was away on a trip to the East Coast in April 1931, Livingston gambled and left the slits out as well. Back in Berkeley, construction of a 9-inch magnet for the new cyclotron had been entrusted to the Federal Telegraph Company, who delivered it to the Physics Department in Berkeley on 3 July. Lawrence had hoped to have the 9-inch running in time for another accelerator meeting of the American Physical Society, this time in Pasadena during 15-20 June 1931, but time ran out while they were tuning up the machine.
