Featured articles edit
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Distributed element circuit, promoted 26 August 2019 (nomination)
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Planar transmission line, promoted 13 February 2019 (nomination)
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Waveguide filter, promoted 2 January 2014 (nomination)
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List of chronometers on HMS Beagle, promoted 18 June 2012 (nomination)  Today's featured list on 17 June 2013, 8,751 hits
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Golding Bird, promoted 13 March 2012 (nomination) Today's featured article on 2 May 2012, 18.6k hits
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Mechanical filter, promoted 3 November 2010 (nomination)
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Distributed element filter, promoted 5 July 2010 (nomination)
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Otto Julius Zobel, promoted 3 October 2009 (nomination)
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GA listings edit
GA 51–64 edit
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Network synthesis, Engineering and technology. Listed 1 December 2020. (Nomination) |
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Earth-return telegraph, Engineering and technology. Listed 20 October 2020. (Nomination) |
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Pavel Schilling, History. Listed 17 October 2020. (Nomination) |
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Needle telegraph, Engineering and technology. Listed 9 July 2020. (Nomination) |
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Foy–Breguet telegraph, Engineering and technology. Listed 29 June 2020. (Nomination) |
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Wigwag (flag signals), Warfare good articles. Listed 12 April 2020. (Nomination) |
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Porcupine (Cheyenne), History good articles. Listed 29 February 2020. (Nomination) |
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Railway surgery, Natural sciences good articles. Listed 23 October 2019. (Nomination) |
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Electrical telegraphy in the United Kingdom, European history good articles. Listed 15 October 2019. (Nomination) |
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Submarine Telegraph Company, Engineering and technology good articles. Listed 4 October 2019. (Nomination) |
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Gutta Percha Company, Engineering and technology good articles. Listed 18 September 2019. (Nomination) |
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William Montgomerie, History good articles. Listed 14 September 2019. (Nomination) |
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British and Irish Magnetic Telegraph Company, Engineering and technology good articles. Listed 11 September 2019. (Nomination) |
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CS Alert (1890), Engineering and technology good articles. Listed 29 August 2019. (Nomination) |
GA 1–50 edit
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Electric Telegraph Company, Engineering and technology good articles. Listed 3 May 2019. (Nomination) |
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Warren P. Mason, Engineering and technology good articles. Listed 17 August 2018. (Nomination) |
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Distributed element circuit, Engineering and technology good articles. Listed 26 July 2018. (Nomination) |
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Clydesdale Motor Truck Company, Engineering and technology good articles. Listed 4 June 2018. (Nomination) |
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Electric bath (electrotherapy), Natural sciences good articles. Listed 28 May 2018. (Nomination) |
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Planar transmission line, Engineering and technology good articles. Listed 8 January 2018. (Nomination) |
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Air stripline, Engineering and technology good articles. Listed 8 January 2018. (Nomination) |
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Elastance, Engineering and technology good articles. Listed 5 April 2017. (Nomination) |
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Historical comet observations in China, Natural sciences good articles. Listed 26 January 2017. (Nomination) |
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Steam devil, Natural sciences good articles. Listed 10 December 2016. (Nomination) |
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Inverted-F antenna, Engineering and technology good articles. Listed 11 November 2015. (Nomination) |
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Staggered tuning, Engineering and technology good articles. Listed 3 July 2015. (Nomination) |
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Mobility analogy, Engineering and technology good articles. Listed 12 June 2015. (Nomination) |
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Mechanical-electrical analogies, Engineering and technology good articles. Listed 15 March 2015. (Nomination) |
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Double-tuned amplifier, Engineering and technology good articles. Listed 30 January 2015. (Nomination) |
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Henry Nock, Engineering and technology good articles. Listed 24 December 2014. (Nomination) |
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Foster's reactance theorem, Engineering and technology good articles. Listed 8 October 2014. (Nomination) |
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Ship's chronometer from HMS Beagle, Engineering and technology good articles. Listed 5 October 2014. (Nomination) |
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Indoor-outdoor thermometer, Engineering and technology good articles. Listed 1 October 2014. (Nomination) |
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Impedance analogy, Engineering and technology good articles. Listed 30 September 2014. (Nomination) |
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Ammonia fuming, Art and architecture good articles. Listed 5 December 2013. (Nomination) |
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Reflections of signals on conducting lines, Engineering and technology good articles. Listed 27 September 2013. (Nomination) |
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Slotted line, Engineering and technology good articles. Listed 4 September 2013. (Nomination) |
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Primary line constants, Engineering and technology good articles. Listed 21 August 2013. (Nomination) |
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Antimetric electrical network, Engineering and technology good articles. Listed 7 August 2013. (Nomination) |
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Flitch of bacon custom, Social sciences and society good articles. Listed 17 July 2013. (Nomination) |
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Waveguide filter, Engineering and technology good articles. Listed 9 July 2013. (Nomination) |
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Wooden Leg: A Warrior Who Fought Custer, History good articles. Listed 22 June 2013. (Nomination) |
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Frog battery, Natural sciences good articles. Listed 14 May 2013. (Nomination) |
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Danish Bacon, Agriculture, food and drink good articles. Listed 29 April 2013. (Nomination) |
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Cooke and Wheatstone telegraph, Engineering and technology good articles. Listed 8 March 2013. (Nomination) |
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Wilhelm Cauer, Mathematics good articles. Listed 6 August 2012. (Nomination) |
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Nominal impedance, Engineering and technology good articles. Listed 2 May 2012. (Nomination) |
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Topology (electrical circuits), Engineering and technology good articles. Listed 20 March 2012. (Nomination) |
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Evan O'Neill Kane, Natural sciences good articles. Listed 31 December 2011. (Nomination) |
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Waffle-iron filter, Engineering and technology good articles. Listed 28 December 2011. (Nomination) |
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Vitold Belevitch, Engineering and technology good articles. Listed 15 October 2011. (Nomination) |
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Voltage doubler, Engineering and technology good articles. Listed 11 October 2011. (Nomination) |
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Power dividers and directional couplers, Engineering and technology good articles. Listed 14 September 2011. (Nomination) |
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Golding Bird, Natural sciences good articles. Listed 3 August 2011. (Nomination) |
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Pulvermacher's chain, Engineering and technology good articles. Listed 19 June 2011. (Nomination) |
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Harpy Tomb, Art and architecture good articles. Listed 8 May 2011. (Nomination) |
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Prototype filter, Engineering and technology good articles. Listed 26 August 2010. (Nomination) |
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Composite image filter, Engineering and technology good articles. Listed 4 August 2010. (Nomination) |
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m-derived filter, Engineering and technology good articles. Listed 14 April 2010. (Nomination) |
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Mechanical filter, Engineering and technology good articles. Listed 9 April 2010. (Nomination) |
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Distributed element filter, Engineering and technology good articles. Listed 18 February 2010. (Nomination) |
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Constant k filter, Engineering and technology good articles. Listed 26 August 2009. (Nomination) |
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Analogue filter, Engineering and technology good articles. Listed 07:17, 31 July 2009. (Nomination) |
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Otto Julius Zobel, Engineering and technology good articles. Listed 02:04, 8 August 2008. (Nomination) |
Did you know? edit
DYK 51–86 edit
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... that Zolotarev polynomials were introduced in 1868, but not applied to Zolotarev filters until 1970? 20 September 2020, 1,287 hits |
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... that Zolotarev polynomials were introduced in 1868, but not applied to Zolotarev filters until 1970? 20 September 2020, 1,287 hits |
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... that mercury pressure gauges as tall as 23 metres (75 ft) have been built to measure very high pressures? 16 September 2020, 4,001 hits |
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... that the needle telegraph built by Carl Friedrich Gauss and Wilhelm Eduard Weber had a needle weighing at least 25 lb (11 kg) 30 May 2020, 3,340 hits |
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... that when Pavel Schilling invited Tsar Nicholas I to touch two wires together, the tsar was greatly surprised by the resulting distant explosion?? 27 May 2020, 5,466 hits |
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... that Telegraph Plateau was so named because it seemed to be an ideal route for a transatlantic telegraph cable? 26 May 2020, 3,190 hits |
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... that interest in network synthesis research is now greater than at any time since the 1950s due to its new applications in mechanics, particularly in Formula One? 18 May 2020, 1,580 hits |
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... that according to Oliver Heaviside, the law of squares does not mean that an electric current knows where it is going? 17 May 2020, 1,850 hits |
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... that an officer continued to send wigwag flag signals (example flags pictured) with a bedsheet after the flagman retreated during Pickett's Charge in 1863? 16 May 2020, 3,565 hits |
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... that the first earth-return telegraph was set up along the Nuremberg–Fürth railway line in 1838? 15 May 2020, 2,685 hits |
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... that the Butler matrix squints? 22 April 2019, 5,783 hits |
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... that telegraphy in the United Kingdom included a system that strung wires from rooftop to rooftop of domestic premises? 3 April 2019, 4,312 hits |
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... that the Electric Telegraph Company operated the Monarch, the first dedicated cable-laying ship? 5 March 2019, 1,104 hits |
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... that the first attempt of the British and Irish Magnetic Telegraph Company to lay a submarine telegraph cable to Ireland failed because the cable would not reach that far? 27 February 2019, 1,787 hits |
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... that the opening of the Submarine Telegraph Company's first oceanic telegraph cable was marked by remotely firing a cannon in Calais from a telegraph station in Dover? 22 February 2019, 2,525 hits |
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... that the Gutta Percha Company, whose main product was submarine telegraph cable, started out making bottle stoppers? 21 February 2019, 3,660 hits |
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... that the cable ship Alert almost completely isolated Germany from the worldwide telegraph network by cutting its submarine telegraph cables just hours after the outbreak of World War I? 4 February 2019, 12,850 hits |
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... that the surgeon Cuthbert Hilton Golding-Bird invented a dilator for use in tracheotomies? 20 January 2019, 999 hits |
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... that William Montgomerie wished that the men who destroyed the Singapore Stone had been more superstitious? 21 December 2018, 1,235 hits |
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... that some railway surgeons opposed the introduction of first aid kits on trains, maintaining that only doctors should carry out this work? 3 August 2018, 5,318 hits |
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... that distributed element circuits include butterflies (pictured)? 14 May 2018, 6,009 hits |
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... that scientist Warren P. Mason said that polymer chemistry was not "civilized" because of the awful smells produced? 8 May 2018, 1,524 hits |
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... that a luminous discharge could be seen around a person taking an electric bath (pictured)? 1 May 2018, 11,038 hits |
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... that the Clydesdale Motor Truck Company was named, in part, after a breed of horse? 28 April 2018, 1,728 hits |
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... that the term elastance, the inverse of capacitance, was coined by Oliver Heaviside to promote an analogy of a capacitor as a spring rather than a container of charge? 26 April 2017, 2,623 hits |
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... that planar transmission lines were developed for the US military, but can be found today in household mass-produced items such as mobile phones and satellite television receivers? 9 March 2017, 6,184 hits |
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... that in an air stripline, air is used as an electrical insulator to reduce transmission losses? 16 February 2017, 3,451 hits |
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... that the first use of a transfer function matrix in control systems was on development of gas turbine engines for the National Advisory Committee for Aeronautics? 13 February 2017, 3,460 hits |
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... that historical comet observations in China as far back as 12 BC have been used to study changes in the brightness of Halley's Comet? 9 February 2017, 2,281 hits |
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... that real ear measurement used by audiologists involves insertion of a probe to within 6 mm of the eardrum? 1 January 2016, 1,254 hits |
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... that writer Thomas B. Marquis once drove into the back of another car while conversing with Thomas H. Leforge in Plains Indian Sign Language? 7 December 2015, 1,254 hits |
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... that the inverted-F antenna, the antenna used in mobile phones, was originally developed for missile telemetry? 30 November 2015, 13,684 hits |
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... that Cassini Grid military maps were made available to the public partly because German bombing of the Ordnance Survey offices delayed the issue of National Grid maps? 20 October 2015, 6,650 hits |
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... that volunteers at the Sorby Research Institute were made to wear the dirty underpants of scabies sufferers? 16 August 2015, 2,346 hits |
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... that a theoretical problem in the mobility analogy led to the inerter being proposed as a new theoretical element of mechanical networks and later fabricated as a real component in Formula One? 17 November 2014, 2,917 hits |
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... that according to the impedance analogy, a spring is analogous to an electrical capacitor? 2 November 2014, 1,677 hits |
DYK 1–50 edit
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... that according to the Imperial War Museum, the youngest authenticated British soldier in World War I 30 December 2013, 9,681 hits |
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... that the technique of darkening oak by ammonia fuming was discovered accidentally when boards stored in a stable were darkened by fumes from horse urine? 8 November 2013, 3,247 hits |
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... that a slotted line for microwave measurement can be made for roughly one ten-thousandth of the cost of a network analyzer? 4 June 2013, 2,756 hits |
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... that via fences (pictured), used to shield printed circuit lines, can also be used to form waveguides? 17 May 2013, 6,224 hits |
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... that waveguide filters {example pictured) used in multiplexers originally needed decoupling resonators for each input, but these were found to be unnecessary by E. J. Curly when he accidentally mistuned a diplexer? 4 May 2013, 5,028 hits |
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... that the Cooke and Wheatstone telegraph (pictured), the first electric telegraph to be put into commercial service, was initially rejected in favour of a pneumatic system with whistles? 2,941 hits |
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... that write-only memory, devised as an insider joke, does have real uses and may even increase the power of a quantum computer? 11 November 2012, 3,878 hits |
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... that Henry Nock, the maker of the seven-barrelled volley gun used by Patrick Harper in Sharpe episodes, founded a company which became Wilkinson Sword? 8 September 2012, 1,535 hits |
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... that the outdoor parts of indoor-outdoor thermometers are used indoors by building service engineers by swinging them around? 3,024 hits17 January 2012, |
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... that the waffle-iron filter from electronics is used on industrial microwave heaters because product can be continuously fed through the inside of the filter? 20 November 2011, 2.6k hits |
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... that electric circuit theorist Vitold Belevitch discovered a mathematical basis for Zipf's law from linguistics? 10 June 2011, 829 hits |
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... that HMS Beagle's chronometers (example pictured) were so important to its mission that John Lort Stokes rescued one despite being speared in the chest by an indigenous Australian? 24 May 2011, 10.6k hits |
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... that steam devils can be more important than convection in vertically transporting moisture during cold air outbreaks? 17 May 2011, 3.6k hits |
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... that a frog battery can decompose potassium iodide? 8 May 2011, 6.0k hits |
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... that Pulvermacher's chain battery was used in experiments by dentists in an attempt to anaesthetise patients with electric shocks? 7 May 2011, 1.7k hits |
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... that the skinny triangle is used by snipers to estimate target range? 3 May 2011, 8.1k hits |
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... that physician Golding Bird invented the electric moxa in order to save patients from having to be burnt with glowing charcoal? 1 March 2011, 2.9k hits |
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... that the Harpy Tomb (pictured) from ancient Xanthos was originally mounted on a stone pedestal seventeen feet above the ground? June 18, 2010, 5.5k hits |
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... that a ship's chronometer from HMS Beagle made by Thomas Earnshaw is now in the British Museum? June 13, 2010, 266 hits |
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... that Foster's reactance theorem ensures that plots on a Smith chart of an electrical network impedance function always travel around the chart in a clockwise direction with increasing frequency? June 10, 2010, 756 hits |
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... that Wooden Leg didn't have one? May 14, 2010, 6.4k hits |
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... that Bio-Blend Fuels produce a biodiesel made from pig fat that smells of bacon? March 2, 2010, 735 hits |
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... that Sir Henry Bate Dudley not only chronicled the life of Gainsborough but also wrote the comic opera The Flitch of Bacon? |March 1, 2010, 222 hits |
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... that a flitch of bacon was offered at Wychnor Hall to married couples if they could swear that they did not regret their union, but it was so rarely claimed it was replaced with a wooden one? March 1, 2010, 7.3k hits |
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... that Danish Bacon is sliced, packed, and sold in the UK? March 2, 2010, 3.0k hits |
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... that the Guinea hog breed of pig was kept by former US President Thomas Jefferson? December 27, 2009, 2.0k hits |
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... that a mechanical filter of phonograph parts (pictured) was designed by Edward Norton as a Butterworth filter prior to Stephen Butterworth publishing his electronic design? November 26, 2009, 2.0k hits |
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... that distributed element filters can use a wide and varied library of printed elements including butterfly and clover stubs? November 16, 2009, 1.6k hits |
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... that AT&T once released designs for 83,539 equivalent transforms of a circuit into the public domain just to deny their competitors the ability to patent them? August 19, 2009, 3.9k hits |
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... that a quarter wave impedance transformer can make an electrical open circuit look like a short circuit? August 18, 2009, 1.5k hits |
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... that surgeon Dr. Evan O'Neill Kane signed his handiwork by tattooing the letter K in Morse code on his patients in India ink? July 25, 2009, 3.2k hits |
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... that roll-off is an electronic filter parameter of significance for removing muscle activity noise in electrocardiograph machines? July 13, 2009, 691 hits |
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... that in designing a new analogue filter, Sidney Darlington found tables of the exact elliptic functions required in an 1829 Latin paper by Carl Jacobi in the New York City Library? July 11, 2009, 1.2k hits |
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... that minimum orbit intersection distance is one of the measures used to determine if a near-Earth object, such as (4953) 1990 MU (orbit pictured), is a Potentially Hazardous Object? May 19, 2009, 3.6k hits |
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... that Henry Wilde melted iron bars to demonstrate the power of his self-energizing dynamo, a machine based on his paper presented to the Royal Society in 1866? March 13, 2009, 1.8k hits |
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... that one form of the general image filters invented by Otto Zobel is a particularly simple band-pass filter consisting of just resonators coupled by capacitors? January 13, 2009, 1.2k hits |
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... that Heinrich Greinacher invented his voltage doubler circuit in 1913 because the 110 volt power supply in Zürich was insufficient for his newly invented ionometer which required 200 volts? January 10, 2009, 1.7k hits |
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... that Paul Boucherot and his partner Georges Claude built an ocean thermal energy conversion plant in Cuba as long ago as 1926? January 4, 2009, 339 hits |
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... that Bartlett's bisection theorem can be used in the design of quartz crystal filter circuits to overcome drawbacks of traditional ladder topology? December 30, 2008, 1.0k hits |
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... that a principal work of mathematician Wilhelm Cauer was twice destroyed during World War II and was only published after his death by his family, who reconstructed it from the table of contents? December 28, 2008, 1.0k hits |
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... that although Carl Emil Krarup was originally a civil engineer, he was responsible for the first ever continuously loaded submarine telecommunication cable? October 9, 2008, 1.2k hits |
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... the loading coil saved AT&T an estimated US$100 million in the first quarter of the 20th century but Oliver Heaviside was paid nothing for the idea? October 3, 2008, 6.3k hits |
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... that George Ashley Campbell decided to use loading coils for improving telephone line quality only after he realized that the manholes were the right distance apart to allow this cheaper solution? 29 September, 2008, 865 hits + 1.7k hits for loading coil |
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... that the lattice phase equaliser was invented by Otto Zobel, better known for his work on constant-resistance networks to equalise amplitude? September 24, 2008, 2.6k hits |
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... that Twin-T topology can be used as a substitute for bridge topology in many electronic circuits when grounding is an issue? September 17, 2008, 2.5k hits |
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... that administering a strong solution of coffee through the rectum by means of a Murphy drip was alleged to have been a treatment for shock at the Battle of Midway? June 25, 2008, 10.1k hits |
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... that Otto Zobel described a method of using prototype filters that does not use the frequency domain to represent their transfer function? June 22, 2008, 594 hits |
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... that the constant k filter was invented by George Campbell but named by Otto Zobel, the inventor of the m-derived filter – both used in composite image filters? June 7, 2008, hit counter offline |
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... that the 120-cell 4-dimensional puzzle (pictured) is one of several n-dimensional sequential move puzzles that have been implemented as virtual puzzles but have never been solved? May 28, 2008, 17.5k hits |
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... that AT&T engineer Otto Zobel helped to establish that electronic noise cannot be completely eliminated from radio and cable transmissions? April 18, 2008, 1.8k hits |