Röntgenröhre
Coolidge also had a breakthrough in 1913 with his hot cathode X-ray tube. Ezekiel Weintraub worked on various projects alongside Coolidge, Whitney, and Langmuir but was especially drawn to wireless telegraphy. Other projects included developing better electrodes, lightning arresters, insulating materials, carbon motors, generator brushes, soapstone plates, electric blanket, etc. While Whitney did not