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Search results: 9 matches found for magnet
  1. Telegraph — 2020-08-15 08:59:24
    …as co-developed and patented by William Fothergill Cooke and Charles Wheatstone. It was beautifully simple using electromagnetism to turn five needles left or right to point to letters. This meant anyone could read the message being sent, no nee…
  2. Loudspeaker — 2020-08-15 08:55:29
    …ent 9712 on Apr 27, 1898 described an improved loudspeaker using a coil connected to a diaphragm, suspended in a strong magnetic field with nonmagnetic spacers to keep the air gap between the inner and outer poles of a moving coil transducer. At…
    …his invention needed was amplification and that came along with the [[Thermionic_valve|valve]]. With more power bigger magnets and cones could now be used. A model of his loudspeaker is in the British Science Museum. {{Image url="LodgeLoudspe…
    … the first practical //'transmitter'// for his telephone in 1877 that was improved by Siemens. It used a permanent bar magnet with a coil of wire wrapped around it, and an iron diaphragm using harmonic vibrations. …
  3. Radio — 2020-08-09 19:56:54
    …d a long history with many scientists contributing. == 1864 == James Clerk Maxwell showed mathematically that electromagnetic waves could propagate through free space. == 1886 == Heinrich Rudolf Hertz noticed a sparking phenomenon and with ex…
    …periments (1887-1888) was able to demonstrate the existence of electromagnetic waves in an experiment confirming Maxwell's theory of electromagnetism. This discovery became known as "Hertzian wav…
  4. Electric Motor — 2018-10-10 01:15:13
    …cists were excited to make the electric motor a useful, stronger device. Over the next few years several inventors made magnetic rotating devices including Rev. William Ritchie. In 1830, Sturgeon produced a vastly improved form of battery – kn…
    …h had a longer battery life than that produced by Italian innovator Volta. Sturgeon could now power his strong electro-magnets and making them horse-shoe shape increased the power even more. But the drawback of creating motion with powerful magn…
    …n was the clever bit. By flipping the current Sturgeon could make the current reverse every time the wheel met the next magnet. That meant the wheel would keep rotating in the //same// direction for as long as the current keeps flowing. In 1832…
  5. Radar — 2017-07-05 11:01:39
    …r Ministry. In 1940, Watson-Watt, assisted by John Randall and Henry Boot of Birmingham University, invented the cavity magnetron. This produced a compact source of short-wave radio waves and allowed Fighter Command to detect incoming enemy plane…
    …s from a much greater distance. == Microwaves == The invention of the **Magnetron** directly led to the invention of the **Microwave Oven.** In 1941 he travelled to the USA in order to advise them …
  6. ATM — 2017-06-27 19:28:18
    …king Association, but received a lukewarm response and only one sale. ::c:: == The Process == Plastic bank cards with magnetic strips had still to be invented, Shepherd-Barron's early machines used special cheques called "Barclaycash" that were…
    …ed the industry to improve the technology and De La Rue's machine was soon surpassed with the advent of bank cards with magnetic strips and [[PIN]] codes. In 2004 for his services to the industry, and his work on ATMs in particular, he was appoi…
  7. Electric Generator — 2017-05-25 11:18:24
    …romagnetic rotation: that is a continuous circular motion from the circular magnetic force around a wire. Ten years later, in 1831, he began his great series of experiments in which he discovered electr…
    …omagnetic induction. These experiments form the basis of modern electromagnetic technology. == Induction == {{image url="First_motor.png" class="left" width="200" }} In 1821 Faraday creates two e…
    …xperiments for the demonstration of electromagnetic rotation. A vertically suspended wire moves in a circular orbit around a magnet. The Homopolar motor. In 1831, using…
    … his "induction ring", Michael Faraday made one of his greatest discoveries - electromagnetic induction: the "induction" or generation of electricity in a wire by means of the electromagnetic effect of a current…
  8. MRI Scan — 2017-02-10 08:41:04
    …l]] Mansfield and Lauterbur were awarded the Nobel Prize in Medicine for inventing the MRI scanner in 2003. MRI, or **magnetic resonance imaging**, uses strong magnetic fields to change the spin of atoms in our bodies. This creates tiny changes…
    …mage url="MRI-Scanner.jpg" class="left" title="Modern MRI Scanner" width="" }} Sir Peter’s early work was in Nuclear Magnetic Resonance (NMR), then being used to study the chemical structure of substances. He joined the Department of Physics, …
    …ty of Nottingham, in 1964, and by the early 1970s was working on the application of NMR to imaging that led directly to Magnetic Resonance Imaging (MRI). == Faster processing == In 1973 Peter showed how the radio signals from MRI could be mathem…
  9. Internal Combustion Engine — 2016-08-23 10:46:47
    …ngineer Edward Butler constructed the first petrol internal combustion engine. Butler invented the spark plug, ignition magneto, coil ignition and spray jet carburetor. {{Image url="Hornsby-Akroyd-Engine.jpg" class="left" title="Hornsby-Akroyd En…

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