This scrapbook covers the years 1874-1880 and contains clippings about radiometers and vacuum pumps. Between pages 110 and 111 is a note that a leaf was removed and placed on exhibit in the Patent Office interference proceedings between Edison and Ludwig Boehm. The spine is labeled "Vacuum Pump -- Tube -- Radiometer -- Elect. Lamp." There are 126 numbered pages.

Courtesy of Thomas Edison National Historical Park.