Any combination of cams, gears, links, belts, chains and logical mechanical elements.
Any process of, or system designed to manage useful energy conversion.
A mental, physical, or chemical process.
The theory that all natural phenomena can be explained by physical causes.
Any mechanical means for the conversion or control of motion, or the transmission or control of power.
A group of entities, such as objects, that interact together.
A valve device in some brass instruments for changing the pitch
A solid disk or cylinder that fits inside a hollow cylinder, and moves under pressure (as in an engine) or displaces fluid (as in a pump)
To move up and down or in and out like a piston.