152,645 Contributions. 1  This circuit is used in most electronic digital computers ever built & was invented in 1918 (patent GB148582). 2  Time is power of Business. 3  This circuit is used in most electronic digital computers ever built & was invented in 1918 (patent GB148582).
There were many people who had a hand in âinventingâ the vacuum cleaner. Every invention and patent has made minor improvements and has evolved into what we use today. Many people are under the assumption that H. Cecil Booth, a British engineer, was the first person to patent the vacuum cleaner in 1901.[1] The first person to patent a version of the vacuum cleaner is Daniel Hess, from West Union, Iowa, in 1860.
Vacuum Diode History Working Principle and Types of Vacuum Diode. History of Vacuum Diode. In November 16, 1904 first vacuum diode was invented by Sir John Ambrose Fleming and it is also called the Fleming valve, the first thermionic valve. In those days there was no existence of p-n junction in electronics field. A conceptual figure of vacuum diode is shown below. How does vacuum tube diode work? Here the vacuum diode works mostly like modern diode. But its size is larger. It consists of a vacuum container with cathode and anode inside. This cathode and anode are connected across a voltage source. The anode is applied with positive voltage with respect to cathode.