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2. Cornish engine valve gear - Wikipedia

   en.wikipedia.org/wiki/Cornish_engine_valve_gear

   The plug rods are two (or one, for some engines) vertical rods attached, via the parallel motion gear, to the beam. As well as providing convenient manual control, the handles can be moved by the plug rod(s), which have small projections – tappets – to catch on the handles. In the case of the steam arbor where the valve needs to be held ...

3. Steam locomotive components - Wikipedia

   en.wikipedia.org/wiki/Steam_locomotive_components

   Hose for conveying force to train brakes by a differential in air pressure. Contains either high-pressure compressed air or air at lower than atmospheric pressure (vacuum), depending on whether the locomotive has an air brake or vacuum brake system. [6]: 483–486 [3]: 1 Water compartment Tank for water to be used by the boiler to produce steam.

4. Central vacuum cleaner - Wikipedia

   en.wikipedia.org/wiki/Central_vacuum_cleaner

   Compatible with standard tools and accessories — Most central vacuum hoses are compatible with a wide range of industry-standard brushes and tools used with ordinary portable vacuum cleaners. In the United States, the de facto standard size is 1 1 / 4 inch (3.175 cm) inside diameter for tools.

5. Piston valve (steam engine) - Wikipedia

   en.wikipedia.org/wiki/Piston_valve_(steam_engine)

   Diagram showing lap and lead and their relation to valve travel. When on the move, a steam locomotive requires steam to enter the cylinder at precise times relative to the piston's position. [3] This entails controlling the admission and exhaust of steam to and from the cylinders with a valve linked to the motion of the piston. [3]

6. Slide valve - Wikipedia

   en.wikipedia.org/wiki/Slide_valve

   It is named after the hollow central D-sectioned piston. This valve worked by "connecting the upper and lower valves so as to be worked by one rod or spindle, and in making the stem or tube which connects them hollow, so as to serve for an induction pipe to the upper end of the cylinder." This allowed two valves to do the work of four.

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   mail.aol.com

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