#electromagnetism

tomsharpIn 1933, Walther Meissner and Robert Ochsenfeld discovered that a superconductor repels a magnetic field when it is cooled below its transition point. <a href="https://mastodon.sdf.org/tags/Poetry" class="mention hashtag" rel="nofollow noopener" target="_blank">#Poetry</a> <a href="https://mastodon.sdf.org/tags/Science" class="mention hashtag" rel="nofollow noopener" target="_blank">#Science</a> <a href="https://mastodon.sdf.org/tags/History" class="mention hashtag" rel="nofollow noopener" target="_blank">#History</a> <a href="https://mastodon.sdf.org/tags/Electromagnetism" class="mention hashtag" rel="nofollow noopener" target="_blank">#Electromagnetism</a> <a href="https://mastodon.sdf.org/tags/Superconductor" class="mention hashtag" rel="nofollow noopener" target="_blank">#Superconductor</a> <a href="https://mastodon.sdf.org/tags/Meissner" class="mention hashtag" rel="nofollow noopener" target="_blank">#Meissner</a> <a href="https://mastodon.sdf.org/tags/Ochsenfeld" class="mention hashtag" rel="nofollow noopener" target="_blank">#Ochsenfeld</a> (<a href="https://sharpgiving.com/thebookofscience/items/p1933.html" rel="nofollow noopener" target="_blank">https://sharpgiving.com/thebookofscience/items/p1933.html</a>)

franco_vazzaA classical <a href="https://mastodon.social/tags/electromagnetism" class="mention hashtag" rel="nofollow noopener" target="_blank">#electromagnetism</a> experiment in this time of the year (i.e. towards the end of my EM course): magnetic breaking acting on a falling magnet (home version).The left magnet just falls in free fall, the right one gets braked by the induced magnetic field within the aluminum cylinder (mad just sticking together three aluminum foil wraps for kitchen use).Where is the induced magnetic field coming from? From <a href="https://mastodon.social/tags/Faraday" class="mention hashtag" rel="nofollow noopener" target="_blank">#Faraday</a>'s induction law of course!<a href="https://mastodon.social/tags/science" class="mention hashtag" rel="nofollow noopener" target="_blank">#science</a> <a href="https://mastodon.social/tags/physics" class="mention hashtag" rel="nofollow noopener" target="_blank">#physics</a> <a href="https://mastodon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#astronomy</a>

Michael VeraI'm claiming Unification, not Perfection:<a href="https://www.michaelvera.org/Unified_Theory_of_Energy.html" rel="nofollow noopener" translate="no" target="_blank">https://www.michaelvera.org/Unified_Theory_of_Energy.html</a><a href="https://mastodon.michaelvera.org/tags/physics" class="mention hashtag" rel="nofollow noopener" target="_blank">#physics</a> <a href="https://mastodon.michaelvera.org/tags/theoreticalphysics" class="mention hashtag" rel="nofollow noopener" target="_blank">#theoreticalphysics</a> <a href="https://mastodon.michaelvera.org/tags/unifiedtheory" class="mention hashtag" rel="nofollow noopener" target="_blank">#unifiedtheory</a> <a href="https://mastodon.michaelvera.org/tags/energy" class="mention hashtag" rel="nofollow noopener" target="_blank">#energy</a> <a href="https://mastodon.michaelvera.org/tags/science" class="mention hashtag" rel="nofollow noopener" target="_blank">#science</a> <a href="https://mastodon.michaelvera.org/tags/quantumphysics" class="mention hashtag" rel="nofollow noopener" target="_blank">#quantumphysics</a> <a href="https://mastodon.michaelvera.org/tags/relativity" class="mention hashtag" rel="nofollow noopener" target="_blank">#relativity</a> <a href="https://mastodon.michaelvera.org/tags/futureofscience" class="mention hashtag" rel="nofollow noopener" target="_blank">#futureofscience</a> <a href="https://mastodon.michaelvera.org/tags/einstein" class="mention hashtag" rel="nofollow noopener" target="_blank">#einstein</a> <a href="https://mastodon.michaelvera.org/tags/newphysics" class="mention hashtag" rel="nofollow noopener" target="_blank">#newphysics</a> <a href="https://mastodon.michaelvera.org/tags/astrophysics" class="mention hashtag" rel="nofollow noopener" target="_blank">#astrophysics</a> <a href="https://mastodon.michaelvera.org/tags/cosmology" class="mention hashtag" rel="nofollow noopener" target="_blank">#cosmology</a> <a href="https://mastodon.michaelvera.org/tags/particlephysics" class="mention hashtag" rel="nofollow noopener" target="_blank">#particlephysics</a> <a href="https://mastodon.michaelvera.org/tags/fundamentalphysics" class="mention hashtag" rel="nofollow noopener" target="_blank">#fundamentalphysics</a> <a href="https://mastodon.michaelvera.org/tags/scienceexploration" class="mention hashtag" rel="nofollow noopener" target="_blank">#scienceexploration</a> <a href="https://mastodon.michaelvera.org/tags/scientificmethod" class="mention hashtag" rel="nofollow noopener" target="_blank">#scientificmethod</a> <a href="https://mastodon.michaelvera.org/tags/unification" class="mention hashtag" rel="nofollow noopener" target="_blank">#unification</a> <a href="https://mastodon.michaelvera.org/tags/gravitationaltheory" class="mention hashtag" rel="nofollow noopener" target="_blank">#gravitationaltheory</a> <a href="https://mastodon.michaelvera.org/tags/electromagnetism" class="mention hashtag" rel="nofollow noopener" target="_blank">#electromagnetism</a> <a href="https://mastodon.michaelvera.org/tags/thermodynamics" class="mention hashtag" rel="nofollow noopener" target="_blank">#thermodynamics</a> <a href="https://mastodon.michaelvera.org/tags/space" class="mention hashtag" rel="nofollow noopener" target="_blank">#space</a> <a href="https://mastodon.michaelvera.org/tags/time" class="mention hashtag" rel="nofollow noopener" target="_blank">#time</a> <a href="https://mastodon.michaelvera.org/tags/matter" class="mention hashtag" rel="nofollow noopener" target="_blank">#matter</a> <a href="https://mastodon.michaelvera.org/tags/sciencematters" class="mention hashtag" rel="nofollow noopener" target="_blank">#sciencematters</a> <a href="https://mastodon.michaelvera.org/tags/scienceisawesome" class="mention hashtag" rel="nofollow noopener" target="_blank">#scienceisawesome</a> <a href="https://mastodon.michaelvera.org/tags/nextgenphysics" class="mention hashtag" rel="nofollow noopener" target="_blank">#nextgenphysics</a> <a href="https://mastodon.michaelvera.org/tags/physicslover" class="mention hashtag" rel="nofollow noopener" target="_blank">#physicslover</a> <a href="https://mastodon.michaelvera.org/tags/physicscommunity" class="mention hashtag" rel="nofollow noopener" target="_blank">#physicscommunity</a> <a href="https://mastodon.michaelvera.org/tags/energytheory" class="mention hashtag" rel="nofollow noopener" target="_blank">#energytheory</a> <a href="https://mastodon.michaelvera.org/tags/unified" class="mention hashtag" rel="nofollow noopener" target="_blank">#unified</a>

tomsharpIn 1920, Joseph Valasek explained ferroelectricity, the electrical polarization of certain materials. <a href="https://mastodon.sdf.org/tags/Poetry" class="mention hashtag" rel="nofollow noopener" target="_blank">#Poetry</a> <a href="https://mastodon.sdf.org/tags/Science" class="mention hashtag" rel="nofollow noopener" target="_blank">#Science</a> <a href="https://mastodon.sdf.org/tags/History" class="mention hashtag" rel="nofollow noopener" target="_blank">#History</a> <a href="https://mastodon.sdf.org/tags/Electromagnetism" class="mention hashtag" rel="nofollow noopener" target="_blank">#Electromagnetism</a> <a href="https://mastodon.sdf.org/tags/Ferroelectricity" class="mention hashtag" rel="nofollow noopener" target="_blank">#Ferroelectricity</a> <a href="https://mastodon.sdf.org/tags/Valasek" class="mention hashtag" rel="nofollow noopener" target="_blank">#Valasek</a> (<a href="https://sharpgiving.com/thebookofscience/items/p1920c.html" rel="nofollow noopener" target="_blank">https://sharpgiving.com/thebookofscience/items/p1920c.html</a>)

tomsharpIn 1919, Heinrich Barkhausen explained the noise heard by radio operators using Marconi’s magnetic detector. <a href="https://mastodon.sdf.org/tags/Poetry" class="mention hashtag" rel="nofollow noopener" target="_blank">#Poetry</a> <a href="https://mastodon.sdf.org/tags/Science" class="mention hashtag" rel="nofollow noopener" target="_blank">#Science</a> <a href="https://mastodon.sdf.org/tags/History" class="mention hashtag" rel="nofollow noopener" target="_blank">#History</a> <a href="https://mastodon.sdf.org/tags/Electromagnetism" class="mention hashtag" rel="nofollow noopener" target="_blank">#Electromagnetism</a> <a href="https://mastodon.sdf.org/tags/Barkhausen" class="mention hashtag" rel="nofollow noopener" target="_blank">#Barkhausen</a> (<a href="https://sharpgiving.com/thebookofscience/items/p1919.html" rel="nofollow noopener" target="_blank">https://sharpgiving.com/thebookofscience/items/p1919.html</a>)

tomsharp1913: Bohr magneton - The book of science - In 1913, Niels Bohr based the quantum unit of magnetization on the Planck constant. <a href="https://mastodon.sdf.org/tags/Poetry" class="mention hashtag" rel="nofollow noopener" target="_blank">#Poetry</a> <a href="https://mastodon.sdf.org/tags/Science" class="mention hashtag" rel="nofollow noopener" target="_blank">#Science</a> <a href="https://mastodon.sdf.org/tags/History" class="mention hashtag" rel="nofollow noopener" target="_blank">#History</a> <a href="https://mastodon.sdf.org/tags/Electromagnetism" class="mention hashtag" rel="nofollow noopener" target="_blank">#Electromagnetism</a> <a href="https://mastodon.sdf.org/tags/Magnetization" class="mention hashtag" rel="nofollow noopener" target="_blank">#Magnetization</a> <a href="https://mastodon.sdf.org/tags/Bohr" class="mention hashtag" rel="nofollow noopener" target="_blank">#Bohr</a> (<a href="https://sharpgiving.com/thebookofscience/items/p1913f.html" rel="nofollow noopener" target="_blank">https://sharpgiving.com/thebookofscience/items/p1913f.html</a>)

tomsharpIn 1913, Henry Moseley created the first atomic battery, using radium to generate electricity. <a href="https://mastodon.sdf.org/tags/Poetry" class="mention hashtag" rel="nofollow noopener" target="_blank">#Poetry</a> <a href="https://mastodon.sdf.org/tags/Science" class="mention hashtag" rel="nofollow noopener" target="_blank">#Science</a> <a href="https://mastodon.sdf.org/tags/History" class="mention hashtag" rel="nofollow noopener" target="_blank">#History</a> <a href="https://mastodon.sdf.org/tags/Electromagnetism" class="mention hashtag" rel="nofollow noopener" target="_blank">#Electromagnetism</a> <a href="https://mastodon.sdf.org/tags/AtomicBattery" class="mention hashtag" rel="nofollow noopener" target="_blank">#AtomicBattery</a> <a href="https://mastodon.sdf.org/tags/Moseley" class="mention hashtag" rel="nofollow noopener" target="_blank">#Moseley</a> (<a href="https://sharpgiving.com/thebookofscience/items/p1913d.html" rel="nofollow noopener" target="_blank">https://sharpgiving.com/thebookofscience/items/p1913d.html</a>)

tomsharpIn 1911, Pierre Weiss experimentally derived a value for the unit of magnetization. <a href="https://mastodon.sdf.org/tags/Poetry" class="mention hashtag" rel="nofollow noopener" target="_blank">#Poetry</a> <a href="https://mastodon.sdf.org/tags/Science" class="mention hashtag" rel="nofollow noopener" target="_blank">#Science</a> <a href="https://mastodon.sdf.org/tags/History" class="mention hashtag" rel="nofollow noopener" target="_blank">#History</a> <a href="https://mastodon.sdf.org/tags/Electromagnetism" class="mention hashtag" rel="nofollow noopener" target="_blank">#Electromagnetism</a> <a href="https://mastodon.sdf.org/tags/Magnetization" class="mention hashtag" rel="nofollow noopener" target="_blank">#Magnetization</a> <a href="https://mastodon.sdf.org/tags/Weiss" class="mention hashtag" rel="nofollow noopener" target="_blank">#Weiss</a> (<a href="https://sharpgiving.com/thebookofscience/items/p1911c.html" rel="nofollow noopener" target="_blank">https://sharpgiving.com/thebookofscience/items/p1911c.html</a>)

tomsharpIn 1908, Kristian Birkeland discovered electric currents in our northern latitudes associated with the aurora. <a href="https://mastodon.sdf.org/tags/Poetry" class="mention hashtag" rel="nofollow noopener" target="_blank">#Poetry</a> <a href="https://mastodon.sdf.org/tags/Science" class="mention hashtag" rel="nofollow noopener" target="_blank">#Science</a> <a href="https://mastodon.sdf.org/tags/History" class="mention hashtag" rel="nofollow noopener" target="_blank">#History</a> <a href="https://mastodon.sdf.org/tags/Electromagnetism" class="mention hashtag" rel="nofollow noopener" target="_blank">#Electromagnetism</a> <a href="https://mastodon.sdf.org/tags/Atmosphere" class="mention hashtag" rel="nofollow noopener" target="_blank">#Atmosphere</a> <a href="https://mastodon.sdf.org/tags/Auroras" class="mention hashtag" rel="nofollow noopener" target="_blank">#Auroras</a> <a href="https://mastodon.sdf.org/tags/Birkeland" class="mention hashtag" rel="nofollow noopener" target="_blank">#Birkeland</a> (<a href="https://sharpgiving.com/thebookofscience/items/p1908f.html" rel="nofollow noopener" target="_blank">https://sharpgiving.com/thebookofscience/items/p1908f.html</a>)

tomsharpIn 1958, James Van Allen sent rockets into space to discover Earth’s shield against the solar wind and the cause of the auroras. <a href="https://mastodon.sdf.org/tags/Poetry" class="mention hashtag" rel="nofollow noopener" target="_blank">#Poetry</a> <a href="https://mastodon.sdf.org/tags/Science" class="mention hashtag" rel="nofollow noopener" target="_blank">#Science</a> <a href="https://mastodon.sdf.org/tags/History" class="mention hashtag" rel="nofollow noopener" target="_blank">#History</a> <a href="https://mastodon.sdf.org/tags/Electromagnetism" class="mention hashtag" rel="nofollow noopener" target="_blank">#Electromagnetism</a> <a href="https://mastodon.sdf.org/tags/Atmosphere" class="mention hashtag" rel="nofollow noopener" target="_blank">#Atmosphere</a> <a href="https://mastodon.sdf.org/tags/Auroras" class="mention hashtag" rel="nofollow noopener" target="_blank">#Auroras</a> <a href="https://mastodon.sdf.org/tags/VanAllen" class="mention hashtag" rel="nofollow noopener" target="_blank">#VanAllen</a> (<a href="https://sharpgiving.com/thebookofscience/items/p1908e.html" rel="nofollow noopener" target="_blank">https://sharpgiving.com/thebookofscience/items/p1908e.html</a>)

Paul Kinsler<a href="https://fediscience.org/@LeoVarnet" class="u-url mention" rel="nofollow noopener" target="_blank">@LeoVarnet</a> E.g. In <a href="https://fediscience.org/tags/electromagnetism" class="mention hashtag" rel="nofollow noopener" target="_blank">#electromagnetism</a>, "magnetic field" can be used to mean either B or H fields. It doesn't help that in many cases the differences is merely a prefactor. As other have said, the only thing to do is explain that the ambiguity or confusion exists, and introduce (or reiterate) a <a href="https://fediscience.org/tags/terminology" class="mention hashtag" rel="nofollow noopener" target="_blank">#terminology</a> that both clarifies & which is more explanatory.FWIW, B is the true magnetic field, and H is a magnetic excitation field (the counterpart of the electric excitation/displacement field D).

tomsharpIn 1907, Pierre Weiss explained that atoms in a ferromagnetic material align in groups called domains. <a href="https://mastodon.sdf.org/tags/Poetry" class="mention hashtag" rel="nofollow noopener" target="_blank">#Poetry</a> <a href="https://mastodon.sdf.org/tags/Science" class="mention hashtag" rel="nofollow noopener" target="_blank">#Science</a> <a href="https://mastodon.sdf.org/tags/History" class="mention hashtag" rel="nofollow noopener" target="_blank">#History</a> <a href="https://mastodon.sdf.org/tags/Electromagnetism" class="mention hashtag" rel="nofollow noopener" target="_blank">#Electromagnetism</a> <a href="https://mastodon.sdf.org/tags/Magnetism" class="mention hashtag" rel="nofollow noopener" target="_blank">#Magnetism</a> <a href="https://mastodon.sdf.org/tags/Weiss" class="mention hashtag" rel="nofollow noopener" target="_blank">#Weiss</a> (<a href="https://sharpgiving.com/thebookofscience/items/p1907d.html" rel="nofollow noopener" target="_blank">https://sharpgiving.com/thebookofscience/items/p1907d.html</a>)

tomsharp1906-1912: Lee de Forest and Irving Langmuir developed vacuum tubes with a third element, capable of amplification. <a href="https://mastodon.sdf.org/tags/Poetry" class="mention hashtag" rel="nofollow noopener" target="_blank">#Poetry</a> <a href="https://mastodon.sdf.org/tags/Science" class="mention hashtag" rel="nofollow noopener" target="_blank">#Science</a> <a href="https://mastodon.sdf.org/tags/History" class="mention hashtag" rel="nofollow noopener" target="_blank">#History</a> <a href="https://mastodon.sdf.org/tags/Electromagnetism" class="mention hashtag" rel="nofollow noopener" target="_blank">#Electromagnetism</a> <a href="https://mastodon.sdf.org/tags/Triode" class="mention hashtag" rel="nofollow noopener" target="_blank">#Triode</a> <a href="https://mastodon.sdf.org/tags/deForest" class="mention hashtag" rel="nofollow noopener" target="_blank">#deForest</a> <a href="https://mastodon.sdf.org/tags/Langmuir" class="mention hashtag" rel="nofollow noopener" target="_blank">#Langmuir</a> (<a href="https://sharpgiving.com/thebookofscience/items/p1906d.html" rel="nofollow noopener" target="_blank">https://sharpgiving.com/thebookofscience/items/p1906d.html</a>)

tomsharp1906: AM broadcasting - The book of science - In 1906, Reginald Fessenden made the first AM radio broadcast of voice and music. <a href="https://mastodon.sdf.org/tags/Poetry" class="mention hashtag" rel="nofollow noopener" target="_blank">#Poetry</a> <a href="https://mastodon.sdf.org/tags/Science" class="mention hashtag" rel="nofollow noopener" target="_blank">#Science</a> <a href="https://mastodon.sdf.org/tags/History" class="mention hashtag" rel="nofollow noopener" target="_blank">#History</a> <a href="https://mastodon.sdf.org/tags/Electromagnetism" class="mention hashtag" rel="nofollow noopener" target="_blank">#Electromagnetism</a> <a href="https://mastodon.sdf.org/tags/AMRadio" class="mention hashtag" rel="nofollow noopener" target="_blank">#AMRadio</a> <a href="https://mastodon.sdf.org/tags/Fessenden" class="mention hashtag" rel="nofollow noopener" target="_blank">#Fessenden</a> (<a href="https://sharpgiving.com/thebookofscience/items/p1906c.html" rel="nofollow noopener" target="_blank">https://sharpgiving.com/thebookofscience/items/p1906c.html</a>)

tomsharpIn 1905, Karl Ferdinand Braun showed how an array of antennas can adjust their phases to aim a radio broadcast, also used today for advanced radar systems. <a href="https://mastodon.sdf.org/tags/Poetry" class="mention hashtag" rel="nofollow noopener" target="_blank">#Poetry</a> <a href="https://mastodon.sdf.org/tags/Science" class="mention hashtag" rel="nofollow noopener" target="_blank">#Science</a> <a href="https://mastodon.sdf.org/tags/History" class="mention hashtag" rel="nofollow noopener" target="_blank">#History</a> <a href="https://mastodon.sdf.org/tags/Electromagnetism" class="mention hashtag" rel="nofollow noopener" target="_blank">#Electromagnetism</a> <a href="https://mastodon.sdf.org/tags/PhasedArray" class="mention hashtag" rel="nofollow noopener" target="_blank">#PhasedArray</a> <a href="https://mastodon.sdf.org/tags/Braun" class="mention hashtag" rel="nofollow noopener" target="_blank">#Braun</a> (<a href="https://sharpgiving.com/thebookofscience/items/p1905b.html" rel="nofollow noopener" target="_blank">https://sharpgiving.com/thebookofscience/items/p1905b.html</a>)

tomsharpIn 1904, John Ambrose Fleming used an Edison-effect bulb as the first vacuum tube. <a href="https://mastodon.sdf.org/tags/Poetry" class="mention hashtag" rel="nofollow noopener" target="_blank">#Poetry</a> <a href="https://mastodon.sdf.org/tags/Science" class="mention hashtag" rel="nofollow noopener" target="_blank">#Science</a> <a href="https://mastodon.sdf.org/tags/History" class="mention hashtag" rel="nofollow noopener" target="_blank">#History</a> <a href="https://mastodon.sdf.org/tags/Electromagnetism" class="mention hashtag" rel="nofollow noopener" target="_blank">#Electromagnetism</a> <a href="https://mastodon.sdf.org/tags/VacuumTube" class="mention hashtag" rel="nofollow noopener" target="_blank">#VacuumTube</a> <a href="https://mastodon.sdf.org/tags/Fleming" class="mention hashtag" rel="nofollow noopener" target="_blank">#Fleming</a> (<a href="https://sharpgiving.com/thebookofscience/items/p1904h.html" rel="nofollow noopener" target="_blank">https://sharpgiving.com/thebookofscience/items/p1904h.html</a>)

tomsharpIn 1904, Ernst Alexanderson designed the first high-power alternator useful for generating radio wave frequencies. <a href="https://mastodon.sdf.org/tags/Poetry" class="mention hashtag" rel="nofollow noopener" target="_blank">#Poetry</a> <a href="https://mastodon.sdf.org/tags/Science" class="mention hashtag" rel="nofollow noopener" target="_blank">#Science</a> <a href="https://mastodon.sdf.org/tags/History" class="mention hashtag" rel="nofollow noopener" target="_blank">#History</a> <a href="https://mastodon.sdf.org/tags/Electromagnetism" class="mention hashtag" rel="nofollow noopener" target="_blank">#Electromagnetism</a> <a href="https://mastodon.sdf.org/tags/Alternator" class="mention hashtag" rel="nofollow noopener" target="_blank">#Alternator</a> <a href="https://mastodon.sdf.org/tags/Alexanderson" class="mention hashtag" rel="nofollow noopener" target="_blank">#Alexanderson</a> (<a href="https://sharpgiving.com/thebookofscience/items/p1904f.html" rel="nofollow noopener" target="_blank">https://sharpgiving.com/thebookofscience/items/p1904f.html</a>)

tomsharpIn 1904, Not long after radio, Christian Hülsmeyer made the first attempt at radar. <a href="https://mastodon.sdf.org/tags/Poetry" class="mention hashtag" rel="nofollow noopener" target="_blank">#Poetry</a> <a href="https://mastodon.sdf.org/tags/Science" class="mention hashtag" rel="nofollow noopener" target="_blank">#Science</a> <a href="https://mastodon.sdf.org/tags/History" class="mention hashtag" rel="nofollow noopener" target="_blank">#History</a> <a href="https://mastodon.sdf.org/tags/Electromagnetism" class="mention hashtag" rel="nofollow noopener" target="_blank">#Electromagnetism</a> <a href="https://mastodon.sdf.org/tags/Radar" class="mention hashtag" rel="nofollow noopener" target="_blank">#Radar</a> <a href="https://mastodon.sdf.org/tags/Telemobiloscope" class="mention hashtag" rel="nofollow noopener" target="_blank">#Telemobiloscope</a> <a href="https://mastodon.sdf.org/tags/H%C3%BClsmeyer" class="mention hashtag" rel="nofollow noopener" target="_blank">#Hülsmeyer</a> (<a href="https://sharpgiving.com/thebookofscience/items/p1904e.html" rel="nofollow noopener" target="_blank">https://sharpgiving.com/thebookofscience/items/p1904e.html</a>)

tomsharpIn 1903, Reginald Fessenden was the first to use a bare-point electrolytic rectifier as a radio wave detector. <a href="https://mastodon.sdf.org/tags/Poetry" class="mention hashtag" rel="nofollow noopener" target="_blank">#Poetry</a> <a href="https://mastodon.sdf.org/tags/Science" class="mention hashtag" rel="nofollow noopener" target="_blank">#Science</a> <a href="https://mastodon.sdf.org/tags/History" class="mention hashtag" rel="nofollow noopener" target="_blank">#History</a> <a href="https://mastodon.sdf.org/tags/Electromagnetism" class="mention hashtag" rel="nofollow noopener" target="_blank">#Electromagnetism</a> <a href="https://mastodon.sdf.org/tags/Detector" class="mention hashtag" rel="nofollow noopener" target="_blank">#Detector</a> <a href="https://mastodon.sdf.org/tags/Fessenden" class="mention hashtag" rel="nofollow noopener" target="_blank">#Fessenden</a> (<a href="https://sharpgiving.com/thebookofscience/items/p1903c.html" rel="nofollow noopener" target="_blank">https://sharpgiving.com/thebookofscience/items/p1903c.html</a>)

tomsharpIn 1902, Reginald Fessenden invented the hot wire barretter based on an effect discovered by Humphry Davy in 1821. <a href="https://mastodon.sdf.org/tags/Poetry" class="mention hashtag" rel="nofollow noopener" target="_blank">#Poetry</a> <a href="https://mastodon.sdf.org/tags/Science" class="mention hashtag" rel="nofollow noopener" target="_blank">#Science</a> <a href="https://mastodon.sdf.org/tags/History" class="mention hashtag" rel="nofollow noopener" target="_blank">#History</a> <a href="https://mastodon.sdf.org/tags/Electromagnetism" class="mention hashtag" rel="nofollow noopener" target="_blank">#Electromagnetism</a> <a href="https://mastodon.sdf.org/tags/Barretter" class="mention hashtag" rel="nofollow noopener" target="_blank">#Barretter</a> <a href="https://mastodon.sdf.org/tags/Fessenden" class="mention hashtag" rel="nofollow noopener" target="_blank">#Fessenden</a> (<a href="https://sharpgiving.com/thebookofscience/items/p1902b.html" rel="nofollow noopener" target="_blank">https://sharpgiving.com/thebookofscience/items/p1902b.html</a>)

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