Learn about the contraption used to reduce friction. Article details the specifications of modern bearings.

Reference article discusses the device used to induce friction in an operation. With details about the mechanisms of how it works.

Read about this measuring device used in science and medical procedures.

Learn about the history of this hole-creating tool for wood, metal, cement and rock. Includes photos.

Learn about how turbojets, ramjets, and turboprops work. Encyclopedia article includes a history of jet propulsion.

Learn about lock types, history and components. Defines bolts, tumblers and talons.

Provides definitions of the main kinds of pump, including the reciprocating, centrifugal and jet varieties.

Discusses the principles involved in the technology, including the reduction of temperature through compression or absorption.

Discover how this tool stores energy, and learn about its practical applications.

Explains the physical characteristics of this form of water, and discusses its many industrial applications. Includes links to related articles.

Read a definition of this device which derives its power from the expansion and contraction of a heated gas.

Explains an application of effort which induces an object to spin around an axis.

Describes the structure, mechanics and applications of this variety of engine, with details on its hydraulic and steam-driven versions.

Discusses the history, methods and practical applications of this field in science and industry.

Chronicles the development of the technology behind the photocopier, and discusses the physical principles involved in this kind of printing.