Manuscript/Mixed Material Lee De Forest's schematic diagrams and scientific notes on hotel stationery, ca. 1915.

About this Item

Title
Lee De Forest's schematic diagrams and scientific notes on hotel stationery, ca. 1915.
Created / Published
1915
Subject Headings
-  Inventors
-  Inventions
-  Communications
-  Radio
-  Audion
-  De Forest, Lee (1873-1961)
-  Electronics
-  Sketches
-  Manuscripts
Genre
Manuscripts
Notes
-  Reproduction number: A27 (color slide; page 1); A28 (color slide; page 2)
-  The prolific American inventor Lee De Forest (1873-1961), is one of several contenders for the title "Father of Radio." Having obtained a doctorate from Yale University in 1899 after writing what was possibly the first dissertation on the newly discovered Hertzian (or radio) waves, De Forest experimented with receiving long-distance radio signals and in 1907 patented an electronic device named the audion. Until this time, radio was considered little more than "wireless telegraphy," since it sent Morse code (dots and dashes) instead of conveying actual sound like the telephone does. De Forest's new three-electrode (triode) vacuum tube boosted radio waves as they were received and made possible what was then called "wireless telephony." To the great surprise and pleasure of nearly everyone, De Forest's invention allowed the human voice, music, or any broadcast signal to be heard loud and clear. De Forest went on to make other contributions to radio and motion pictures, but his audion remains undoubtedly the most important development in electronics until the transistor was invented in 1948. Shown here are examples of De Forest's schematic diagrams and notes scribbled hurriedly on hotel stationery around 1915.
Source Collection
Lee De Forest Papers
Repository
Manuscript Division
Online Format
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IIIF Presentation Manifest
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