Shows A - Z : How's That Work? : Oven, Fire Extinguisher, CD Player : Home & Garden Television

Oven, Fire Extinguisher, CD Player
The modern oven can be traced back to 1832. That's when a man named James Sharp made a metal oven heated by burning gas. Back then controlling the temperature inside the oven was an art. But in 1915, a gas water heater thermostat was added to an oven, and the first electric oven with temperature control was born. Next, in 1908 the first portable fire extinguisher was introduced. It used bicarbonate soda to douse flames and was packed inside a tall cylinder that was simply uncapped and swung like a baseball bat toward the base of the fire. By 1930, fueled by the demand for fire safety in industry, extinguishers powered by compressed gas appeared in factories. Finally, 100 years after Edison invented the phonograph record, a joint effort between some of the biggest electronics companies in the world produced a system that used a digital signal to read and record sound. Unveiled in 1982, the compact disc, now better known as the CD, stored information on a thin piece of metal sandwiched inside a plastic disc. The small size, resistance to physical damage and pure digital sound quality makes them sound much better than traditional vinyl LPs or magnetic tapes.

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