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The Duquesne Brewery clock in 2019, with no advertising on the face. The 60-by-60-foot (18 m × 18 m) clock face, with a 35-foot (11 m) minute hand and a 25-foot (7.6 m) hour hand, [2] both of laminated aluminum, is nearly twice the size of London 's Big Ben, and was built in Georgia by Audichron for $12,500 and shipped to Pittsburgh. [3]
A neon lamp (also neon glow lamp) is a miniature gas-discharge lamp. The lamp typically consists of a small glass capsule that contains a mixture of neon and other gases at a low pressure and two electrodes (an anode and a cathode ). When sufficient voltage is applied and sufficient current is supplied between the electrodes, the lamp produces ...
Nixie tube. A Nixie tube ( English: / ˈnɪk.siː / NIK-see ), or cold cathode display, [ 1] is an electronic device used for displaying numerals or other information using glow discharge . The glass tube contains a wire-mesh anode and multiple cathodes, shaped like numerals or other symbols. Applying power to one cathode surrounds it with an ...
The Shortt–Synchronome clock, an electrical driven pendulum clock designed in 1921, was the first clock to be a more accurate timekeeper than the Earth itself. [167] A succession of innovations and discoveries led to the invention of the modern quartz timer. The vacuum tube oscillator was invented in 1912. [168]
Neon lights are a type of cold cathode gas-discharge light. A neon tube is a sealed glass tube with a metal electrode at each end, filled with one of a number of gases at low pressure. A high potential of several thousand volts applied to the electrodes ionizes the gas in the tube, causing it to emit colored light.
The Colgate Clock, located at a former Colgate-Palmolive factory in Clarksville, Indiana, is one of the largest clocks in the world. It has a diameter of 40 feet (12 meters). It was first illuminated in Clarksville on November 17, 1924. It is located directly across the Ohio River from Louisville, Kentucky .
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