Please contact the contributing institution for more information regarding the copyright status of this object.
Description
Experimental oscillating (cold cathode) tube built by Philo Farnsworth in 1934, and used to transmit paid wireless traffic over the Globe Wireless System from San Francisco to Manila. A newspaper photograph attached to the original Perham Foundation accession worksheet, dated September 21, 1934, from The San Mateo Times, titled, "Development of Television Seen With New Tube," reads "A new cathode ray tube, utilizing neither filament, grid nor screens, and generating high-frequency direct current for use in short-wave radio broadcasting and television sending, has been announced by Philo Farnsworth, 28-year-old inventor, and the Heintz-Kaufman laboratories of South San Francisco. Ralph Heintz is explaining functions of the invention at tests of the tube--placed directly in front of him. Experts predict immediate development of television broadcasting stations through use of the tubes."
Type
image
Identifier
2ABDB404-04E8-49A5-A11C-256458692454 2003-1-32
Subject
Inventors Oscillators, Electric (LCSH) Globe Wireless Telegraph, Wireless (LCSH) Cathode ray tubes (LCSH) Shortwave radio (LCSH) Heintz and Kaufman Farnsworth, Philo Taylor Heintz, Ralph M., Sr
If you're wondering about permissions and what you can do with this item, a good starting point is the "rights information" on this page. See our terms of use for more tips.
Share your story
Has Calisphere helped you advance your research, complete a project, or find something meaningful? We'd love to hear about it; please send us a message.
