From the May 20, 1933, issue
By Science News
LARGEST X-RAY TUBE BEGINS TO BATTLE AGAINST CANCER
The mightiest weapon yet to enter the war against cancer was put in operation at the Mercy Hospital Institute of Radiation Therapy of Chicago. It is a new, 800,000-volt X-ray tube that, operating on a current of 1/100 of an ampere, is estimated to emit radiation equal in quantity to that from $75,000,000 worth of radium.
The giant tube is 14 feet long and is composed of two sections. It was built at Schenectady by Dr. W.D. Coolidge and his associates. The apparatus exceeds by 100,000 volts the working voltage of any other installation known to be in regular operation, the General Electric Co. says, and has a current capacity twice as great as that of any other very-high-voltage X-ray tube and machine.