hydraulic rotary drilling
21tunnels and underground excavations — ▪ engineering Introduction Great tunnels of the world Great tunnels of the worldhorizontal underground passageway produced by excavation or occasionally by nature s action in dissolving a soluble rock, such as limestone. A vertical opening …
22Milling machine — For the machine used in road construction, see Asphalt milling machine. Not to be confused with mill (grinding). Example of a bridge type CNC vertical milling center …
23Deep foundation — A deep foundation installation for a bridge in Napa, California, United States …
24Chuck (engineering) — Self centering three jaw chuck and key with one jaw removed and inverted showing the teeth that engage in the scroll plate. The scroll plate is rotated within the chuck body by the key, the scroll engages the teeth on the underside of the jaws… …
25Drill string — A drill string on a drilling rig is a column, or string, of drill pipe that transmits drilling fluid (via the mud pumps) and torque (via the kelly drive or top drive) to the drill bit. The term is loosely applied as the assembled collection of… …
26Diffusion of technology in Canada — This article outlines the history of the diffusion or spread of technology in Canada. Technologies chosen for treatment here include, in rough order, transportation, communication, energy, materials, industry, public works, public services… …
27Disc brake — Close up of a disc brake on a car On automobiles, disc brakes are often located with …
28Fracturation hydraulique — La « fracturation hydraulique » est la dislocation ciblée de formations géologiques peu perméables[1]’[2] par le moyen de l injection sous très haute pression d un fluide destiné à fissurer et micro fissurer la roche. Cette fracturation …
29List of Historic Mechanical Engineering Landmarks — The following is a list of Historic Mechanical Engineering Landmarks as designated by the American Society of Mechanical Engineers since it began the program in 1971. The designation is granted to existing artifacts or systems representing a… …
30technology, history of — Introduction the development over time of systematic techniques for making and doing things. The term technology, a combination of the Greek technē, “art, craft,” with logos, “word, speech,” meant in Greece a discourse on the arts, both… …
