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Aug 6, 2015 · It's the 101st anniversary of the first electric traffic signal system. On August 5, 1914, in Cleveland, Ohio, engineers installed a pair of green and red li...
- 8 min
- 1850
- bajain news
Did you know Cleveland, Ohio, installed the first traffic light in the US back in 1914?Discover the mystery and impact of this groundbreaking invention.#Clev...
- 53 sec
- 437
- Verdant Traveler
The Hall of Mirrors at Versailles was the first room in history to be illuminated to something approaching the light-levels we’d find safe and pleasant today. Its ubiquitous glass reflected candle-light so effectively that the French court began for the first time to hold regular evening parties.
Aug 5, 2015 · On August 5, 1914, in Cleveland, Ohio, engineers installed a pair of green and red lights facing each side of a four-way intersection — a simple experiment that has since shaped roads around the...
- Joseph Stromberg
- 12 min
- Early History
- The Incandescent Bulb
- The Tungsten Filament
- The Fluorescent Lamp
- Light-Emitting Diodes
The first demonstration of incandescence is credited to Ebenezer Kinnersley. An English scientist and inventor, he wrote to Benjamin Franklin in 1761 that he had heated a metal wire to the point of it glowing red hot. In 1802, Humphry Davy, a British chemist, connected a battery he made to a thin strip of platinum, causing the metal to glow, althou...
The incandescent bulb as we know it today has its origins in the works of two men: Joseph Swan, a British physicist and chemist, and Thomas Edison, the American inventor and businessman. In 1850, Swan worked with carbonized paper filaments in an evacuated bulb, and by 1860 was able to demonstrate the invention. Swan used a pump to evacuate the bulb...
Although in widespread use by the 1890s, the use of a carbon filament would ultimately prove inefficient. In 1904, Sándor Just, an Austro-Hungarian chemist and Franjo Hanaman, a Croatian inventor and engineer, patented a tungsten filament lamp that lasted longer and emitted brighter light than carbon filaments. By 1911, with developments from Willi...
Alongside the development of the incandescent lamp was the fluorescent bulb. Credited to Heinrich Geissler in 1856, the fluorescent lamp saw its beginnings with the Geissler tube, a partially evacuated tube with electrodes at either end. When different chemicals were placed inside, the tube would glow in various colors. The Geissler tube was mainly...
The most recent incarnation of the light bulb comes in the form of the LED. A light-emitting diode is a semiconductor that emits light when a current flows through it. This current is produced by electrons and electron holes (a lack of an electron) interacting. To keep it simple, electrons orbit around atoms at various levels. When an electron move...
Dec 2, 2017 · Dec 2, 2017 Ian Harvey. World War I introduced 20 th century inventions that proved so useful that they remained popular long after the war was over. Here are the stories behind the most interesting inventions: Sun lamps.
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May 21, 2014 · Thousands of miles of trenches were built during World War I and, for the soldiers living in them, their day-to-day life was nothing short of horrific.
- 3 min
- 4.2M
- HISTORY
