Invention of Electron Tube Diode

Electrical engineer, John Ambrose Fleming invented the electron tube diode in 1904 at University College in London, England. Continue reading

Printed Circuits for Anti-Aircraft Shells

Paul Eisler, an Austrian expatriate living in London, England invented printed circuits in 1936. Continue reading

First Military Radar Experiment

The Naval Research Laboratory (NRL) in Washington, DC, USA conducted the first military radar experiment in 1922 Continue reading

Graphophone – The First Dictation Device

Chichester Bell and Charles Tainter patented the Graphophone, a treadle-powered dictation device in 1885. Continue reading

First Electronic Pocket Calculator

Texas Instruments of Dallas, TX, USA introduced a battery-powered electronic pocket calculator on Continue reading

Two Americans Invented the First Laser

Charles Hard Townes and Arthur Leonard Schawlow, physicists from New York, NY USA invented the laser in 1951. Continue reading

Edison Invents the Phonograph

Thomas Alva Edison secured a U.S. patent on February 19, 1878 in Menlo Park, NJ, USA for the phonograph or speaking machine design which developed from an idea for a telegraph repeater. Continue reading

Invention of FIrst Sound Recording Device

Emile-Hortensius-Charles Cros, French poet and inventor designed the paleophone or type of phonograph on April 30, 1877. Continue reading

Sony Watchman TV

Sony KK of Japan introduced the Watchman in 1984, Continue reading

Mass Produced Double-Sided Recording Discs

In 1904, a manufacturing company called Odeon Company of Germany began mass-producing double-sided recording discs. Continue reading