Linkage (mechanical)
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A mechanical linkage is an assembly of systems connected to manage forces and movement. The movement of a body, or link, is studied using geometry so the link is considered to be rigid. The connections between links are modeled as providing ideal movement, pure rotation or sliding for example, and are called joints. A linkage modeled as a network of rigid links and ideal joints is called a kinematic chain.
Variable stroke engine (Autocar Handbook, Ninth edition)
An extended scissor lift
Locking pliers exemplify a four-bar, one degree of freedom mechanical linkage. The adjustable base pivot makes this a two degree-of-freedom five-bar linkage.
Watt steam engine
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The Watt steam engine design became synonymous with steam engines, and it was many years before significantly new designs began to replace the basic Watt design.
A late version of a Watt double-acting steam engine, built by D. Napier & Son (London) in 1832, now in the lobby of the Superior Technical School of Industrial Engineers of the UPM (Madrid). Steam engines of this kind propelled the Industrial Revolution in Great Britain and the world.
The model Newcomen engine upon which Watt experimented
The major components of a Watt pumping engine
Watt's parallel motion on a pumping engine