propulsion period
1United States gravity control propulsion research (1955 - 1974) — American interest in gravity control propulsion research intensified during the early 1950s. Literature from that period used the terms anti gravity, anti gravitation, baricentric, counterbary, electrogravitics, G projects, gravitics, gravity… …
2Spacecraft propulsion — A remote camera captures a close up view of a Space Shuttle Main Engine during a test firing at the John C. Stennis Space Center in Hancock County, Mississippi Spacecraft propulsion is any method used to accelerate spacecraft and artificial… …
3Beam-powered propulsion — is a class of spacecraft propulsion mechanisms that use energy beamed to the spacecraft from a remote power plant. Most designs are rocket engines where the energy is provided by the beam, and is used to superheat propellant that then provides… …
4Carboniferous Period — Interval of geologic time 354–290 million years ago, marked by great changes in world geography. All the landmasses drew closer together as a result of tectonic plate movements. The supercontinent Gondwana occupied much of the Southern Hemisphere …
5rowing — Propulsion of a boat by means of oars. As a sport, it involves one of two kinds of boat: (1) the shell, a narrow, light racing boat propelled by eight rowers pulling single oars under the direction of a coxswain; and (2) the scull, a racing shell …
6Marine steam engine — Period cut away diagram of a triple expansion steam engine installation, circa 1918 A marine steam engine is a reciprocating steam engine that is used to power a ship or boat. Steam turbines and diesel engines largely replaced reciprocating steam …
7ship — shipless, adj. shiplessly, adv. /ship/, n., v., shipped, shipping. n. 1. a vessel, esp. a large oceangoing one propelled by sails or engines. 2. Naut. a. a sailing vessel square rigged on all of three or more masts, having jibs, staysails, and a… …
8technology, 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… …
9naval ship — Introduction the chief instrument by which a nation extends its military power onto the seas. Warships protect the movement over water of military forces to coastal areas where they may be landed and used against enemy forces; warships… …
10submarine — n. /sub meuh reen , sub meuh reen /; adj., v. /sub meuh reen /, n., adj., v., submarined, submarining. n. 1. a vessel that can be submerged and navigated under water, usually built for warfare and armed with torpedoes or guided missiles. 2.… …
