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  • All fields: waves
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    • Crova's Apparatus, circa 1868

    • Crova's Apparatus, circa 1868

    • Scientific apparatus and instruments

    • Crova's apparatus was designed for the purpose of representing vibratory movements on the screen, with 8 disks. Turning the crank past a vertical slit caused the disks to rotate, while a beam of light from the optical system impinged on the slit...
    • Silicon Valley History Online
    • Lee De Forest, 1923

    • Lee De Forest, 1923

    • De Forest, Lee, 1873-1961; Owen, Freeman; Men; Cameras

    • Written on back of photograph, "Dr. De Forest with his laboratory assistant, Freeman Owen. Dr. De Forest's little tube made possible the recording of sound waves (1923) Phonofilm-Glowlight." Photo shows De Forest and Owen with a tube and...
    • Silicon Valley History Online
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