boring shaft
1Jack shaft — Jack Jack (j[a^]k), n. [F. Jacques James, L. Jacobus, Gr. ?, Heb. Ya aq[=o]b Jacob; prop., seizing by the heel; hence, a supplanter. Cf. {Jacobite}, {Jockey}.] [1913 Webster] 1. A familiar nickname of, or substitute for, John. [1913 Webster] You… …
2Well boring — Well Well, n. [OE. welle, AS. wella, wylla, from weallan to well up, surge, boil; akin to D. wel a spring or fountain. ????. See {Well}, v. i.] [1913 Webster] 1. An issue of water from the earth; a spring; a fountain. [1913 Webster] Begin, then,… …
3hand tool — any tool or implement designed for manual operation. * * * Introduction any of the implements used by craftsmen in manual operations, such as chopping, chiseling, sawing, filing, or forging. Complementary tools, often needed as auxiliaries to… …
4Tunnel — This article is about underground passages. For other uses, see Tunnel (disambiguation). Underground tunnel for heatpipes between Rigshospitalet and Amagerværket in Denmark …
5Drill bit — For the fictional character, see Drill Bit (Transformers). For the cancelled skyscraper nicknamed Drill bit, see Chicago Spire. For the types used in drilling wells, see Well drilling. From top to bottom: Spade, lip and spur (brad point), masonry …
6Deep foundation — A deep foundation installation for a bridge in Napa, California, United States …
7Dublin Port Tunnel — Dublin Port Tunnel, southbound entrance, December 2006 …
8Channel Tunnel — Map of the Channel Tunnel Overview Location English Channel (Strait of Dover) Coordinates Folkestone …
9Hoosac Tunnel — The Hoosac Tunnel (also called Hoosic or Hoosick Tunnel) is a 4.75 mile long (7.64 km) railroad tunnel in western Massachusetts which passes through the Hoosac Range, an extension of Vermont s Green Mountains.The tunnel s east portal is in… …
10military technology — Introduction range of weapons, equipment, structures, and vehicles used specifically for the purpose of fighting. It includes the knowledge required to construct such technology, to employ it in combat, and to repair and replenish it.… …
