Home Technology

1184 words - 5 pages

Intro Sample...



The Toilet Yes...those tales you've heard are true. The toilet was first patented in England in 1775, invented by one Thomas Crapper, but the extraordinary automatic device called the flush toilet has been around for a long time. Leonardo Da Vinci in the 1400's designed one that worked, at least on paper, and Queen Elizabeth I reputably had one in her palace in Richmond in 1556, complete with flushing and overflow pipes, a bowl valve and a drain trap. In all versions, ancient and modern, the working principle is the same. Tripping a single lever (the handle) sets in motion a series of actions. The trip handle lifts the seal, usually a rubber flapper, allowing water to flow into the bowl. When the tank is nearly... View More »

Body Sample...


The frost melts and drains away when the coils are warmed during the defrost cycle which is initiated by a timer, and ended by the defrost limiter, before the frozen food melts. A small heater prevents condensation between the compartments, the freezer thermostat turns the compressor on and off, and the temp control limits cold air entering the fridge, by means of an adjustable baffle. Smoke Detectors Is your smoke detector good at scaring to death spiders who carelessly tiptoe inside it? Have you ever leapt out of the shower, clad only in you-know-what, to the piercing tones of your alarm, triggered merely by your forgetting the close the bathroom door? Is it supposed to do this? There are two types of smoke detectors on the market; the photoelectric smoke detector and ionization chamber smoke detector. The photoelectric type uses a photoelectric bulb that shines a beam of light through a plastic maze, called a catacomb. The light is deflected to the other end of the maze where it hits a photoelectric cell. Any smoke impinging on this light triggers the alarm (as do spiders and water droplets in the air!). The ionization chamber type contains a small radiation source, usually a man-made element called Americium. The element produces electrically-charged air molecules called ions, and their presence allows a small electric current to flow in the chamber. When smoke particles enter the chamber they attach themselves to these ions, reducing the flow of current and triggering the alarm. Both types are considered equally effective and may be ...

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