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A vacuum interrupter uses a high vacuum to extinguish the arc between a pair of contacts. As the contacts move apart, current flows through a smaller area. There is a sharp increase in resistance between the contacts, and the temperature at the contact surface increases rapidly until the occurrence of electrode-metal evaporation.
In 1946, Regina's stick vacuum, the ElectrikBroom, made its debut; reaching its peak sales in the 1960s and 1970s and retaining profitability until production ceased in 1994. Options added during this time were the Pile Dial in 1963, 2-speeds in 1965, 3-speeds in 1970, and the Power Team brush roll model in 1982.
Lists of covers of Time magazine list the people or topics on the cover of Time magazine. Time was first published in 1923. As Time became established as one of the United States' leading news magazines, an appearance on the cover of Time became an indicator of notability, fame or notoriety. The lists are organized by decade.
Electromechanical protective relays operate by either magnetic attraction, or magnetic induction. [9]: 14 Unlike switching type electromechanical relays with fixed and usually ill-defined operating voltage thresholds and operating times, protective relays have well-established, selectable, and adjustable time and current (or other operating parameter) operating characteristics.
It received vacuum (port E on the switch) from the carburetor. The vacuum flowed through the switch to a vacuum solenoid (such as a heat riser, used to restrict exhaust allowing the engine to heat up faster). When the coolant heated to operating temperature the vacuum switch closed off the port (port S on the vacuum switch) turning off the ...
A Glock switch, a tiny device that can turn a handgun into a machine gun, continue to show up in Columbus. Glock switches: How use of small device that makes guns automatic exploded in Columbus ...
A simple 24-hour cyclical electromechanical time switch with a French CEE 7/5 socket. A time switch (also called a timer switch, or simply timer) is a device that operates an electric switch controlled by a timer. Intermatic introduced its first time switch in 1945, which was used for "electric signs, store window lighting, apartment hall ...
These are commonly used in automobiles to alter the behavior of vacuum switches, vacuum motors, and other vacuum devices. The engine in a common automobile produces almost 20 inches of mercury (68 kPa ) of vacuum, and this pressure differential has been utilized for everything from automatic locks and windshield wipers to operating emissions ...