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    While most beings are from real-life known myths and legends, others are completely original and made up for the show, such as breezies.

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    Heat engines are divided into two categories -- internal combustion (burning) and external combustion.A conventional gasoline engine is an internal combustion engine; gasoline is burned inside the cylinders to produce hot gases whose expansion moves the pistons.

    In a true steam engine, work is done by steam pressure, rather than by condensation.Each of these three major types is further classified as to the axis of the piston shaft or turbine cylinder (vertical, inclined or horizontal), by the type of valve gear ("D", piston, poppet or rotary), and by the number of cylinders (or turbine stages) used for expanding the steam (single, double, triple or quadruple expansion).Stationary engines were produced with vertical, horizontal or inclined cylinders.The boilers which contained the steam were prone to explode.This occurred for a variety of reasons: undetected corrosion or furring of the heated surfaces, clumsy repairs, or failure to keep the water up to the required level, so causing firebox plates to overheat.Railway locomotives generally had horizontal cylinders, although a few specialized types were produced with vertical or inclined cylinders.Ships started off with horizontal cylinders driving paddle wheels, but quickly changed to vertical cylinders and pistons driving screw propellers through a crankshaft.The Museum of American Heritage pays tribute to the Age of Steam in this exhibit, Dreams of Steam: The History of Steam Power.The age of steam is etched firmly into America's historical memories through its romantic association with railroading, folk songs, travels with Mark Twain on the Mississippi and the personal experiences of generations of Americans.In order to gain efficiency, many engines were built with multiple cylinders that allowed the exhaust from the preceding cylinder to be expanded again in a larger secondary, tertiary or quaternary cylinder, again driving a piston.In ships and factories, double and triple expansion engines were common, as their additional size and weight were compensated by added efficiency and lower fuel consumption.About 2,000 years ago, Greek mathematician Hero experimented with steam power, constructing a rudimentary rotary steam engine.A spinning ball driven by steam jets, he considered the device a toy.The force produced by this expansion is the source of power in all steam engines.

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