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AEO Lightbulb Sent to Samuel H. Adams

 Unprocessed
Identifier: yhm-arc-0000-216

Content Description

Lightbulb--AEO: Theodore W. Case sent this lightbulb made 5/29/1929 to S.H. Adams on 6/11/1931 -- 1917 - Theodore W. Case developed the Thalofide photocell that used thallium oxysulfide. By 1922 he developed the Aeo-light as a source of modulated light. E. I. Sponable worked with Case after 1916 and from 1922 to 1925 he shared equipment with de Forest. Case and Sponable in 1924 developed a sound recording mechanism for a modified Bell and Howell camera using the Aeo-light tube. After breaking off from de Forest in 1925, Case began to develop a projector sound head, offset 20 frames at a speed of 90 ft. per min., using a narrow slit with a helical filament. General Electric and Western Electric were developing their own sound systems, so did not wish to buy into the Case-Sponable system. William Fox licensed the system July 23, 1926, and organized the Fox-Case Corp. with Courtland Smith as president to develop what became known as the Movietone News service. Sponable left the Case lab to join Fox in designing the recording studios in New York and Hollywood, and he designed in 1927 a screen that allowed sound to pass through the screen. The Fox-Case Corp. licensed amplifiers and speakers from Western Electric in 1926 and from ERPI organized in January 1927. From http://history.sandiego.edu/GEN/recording/motionpicture1.html (see also http://en.wikipedia.org/wiki/Movietone_sound_system )

Acquisition Type

Gift

Provenance

Theodore W. Case sent this lightbulb made 5/29/1929 to S.H. Adams on 6/11/1931

Restrictions Apply

No