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Old 09-06-2013, 10:47 PM   #11
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Default Re: How Things Work

How a Radial Engine Works


The radial engine is a reciprocating type internal combustion engine configuration in which the cylinders point outward from a central crankshaft like the spokes of a wheel. It resembles a stylized star when viewed from the front, and is called a “star engine” (German Sternmotor) in some languages. The radial configuration was very commonly used in aircraft engines before turbine engines became predominant.
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Old 09-06-2013, 10:47 PM   #12
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Default Re: How Things Work

How the Geneva Drive Works


The Geneva drive or Maltese cross is a gear mechanism that translates a continuous rotation into an intermittent rotary motion. The rotating drive wheel has a pin that reaches into a slot of the driven wheel advancing it by one step. The drive wheel also has a raised circular blocking disc that locks the driven wheel in position between steps.

The name derives from the device’s earliest application in mechanical watches, Switzerland and Geneva being an important center of watchmaking. Another application of the Geneva drive is in movie projectors: the film does not run continuously through the projector. Instead, the film is advanced frame by frame, each frame standing still in front of the lens for 1/24 of a second (and being exposed twice in that time, resulting in a frequency of 48 Hz). This intermittent motion is achieved using a Geneva drive.
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Old 09-06-2013, 10:48 PM   #13
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Default Re: How Things Work

How the Spinning Dancer Illusion Works




The Spinning Dancer is a kinetic, bistable optical illusion resembling a pirouetting female dancer. Some observers initially see the figure as spinning clockwise and some counterclockwise. Additionally, some may see the figure suddenly spin in the opposite direction. The illusion derives from an inherent ambiguity from the lack of visual cues for depth.
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Old 09-06-2013, 10:49 PM   #14
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Default Re: How Things Work

How a Hypotrochoid is Made


A hypotrochoid is a roulette traced by a point attached to a circle of radius r rolling around the inside of a fixed circle of radius R, where the point is a distance d from the center of the interior circle.
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Old 09-06-2013, 10:50 PM   #15
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Default Re: How Things Work

How an Alpha Stirling Engine Works


A Stirling engine is a heat engine operating by cyclic compression and expansion of air or other gas, the working fluid, at different temperature levels such that there is a net conversion of heat energy to mechanical work. Or more specifically, a closed-cycle regenerative heat engine with a permanently gaseous working fluid, where closed-cycle is defined as a thermodynamic system in which the working fluid is permanently contained within the system, and regenerative describes the use of a specific type of internal heat exchanger and thermal store, known as the regenerator. It is the inclusion of a regenerator that differentiates the Stirling engine from other closed cycle hot air engines.
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Old 09-06-2013, 10:51 PM   #16
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Default Re: How Things Work

How to Draw a Yin Yang Symbol
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Old 09-06-2013, 10:51 PM   #17
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Default Re: How Things Work

How a Wankel Engine Works


The Wankel engine is a type of internal combustion engine using an eccentric rotary design to convert pressure into a rotating motion instead of using reciprocating pistons. Its four-stroke cycle takes place in a space between the inside of an oval-like epitrochoid-shaped housing and a rotor that is similar in shape to a Reuleaux triangle but with sides that are somewhat flatter. The very compact Wankel engine delivers smooth high-rpm power. It is commonly called a rotary engine, though this name applies also to other completely different designs.

The engine was invented by German engineer Felix Wankel. He received his first patent for the engine in 1929, began development in the early 1950s at NSU, completing a working prototype in 1957. NSU then licensed the concept to companies around the world, which have continued to improve the design. It is the only internal combustion engine invented in the twentieth century to go into production.

Thanks to their compact design, Wankel rotary engines have been installed in a variety of vehicles and devices including automobiles, motorcycles, racers, aircraft, go-karts, jet skis, snowmobiles, chain saws, and auxiliary power units.
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Old 09-06-2013, 10:52 PM   #18
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Default Re: How Things Work

How a Sewing Machine Works

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Old 09-06-2013, 10:53 PM   #19
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Default Re: How Things Work

How the Sun and Planet Gear Works


The sun and planet gear (also called the planet and sun gear) was a method of converting reciprocal motion to rotary motion and was utilised in a reciprocating steam engine. It was invented by the Scottish engineer William Murdoch, an employee of Boulton and Watt, but was patented by James Watt in October 1781. It was invented to bypass the patent on the crank, held by James Pickard. It played an important part in the development of devices for rotation in the Industrial Revolution.
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Old 09-06-2013, 10:53 PM   #20
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Default Re: How Things Work

How The New York Times Crossword
Before the 1996 Election Worked


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