drill and thinner

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• Drill pipe — Drill pipe, is hollow, thick walled, steel piping that is used on drilling rigs to facilitate the drilling of a wellbore and comes in a variety of sizes, strengths, and weights but are typically 30 to 33 feet in length. They are hollow to allow… …   Wikipedia

• Bow drill — The bow drill is an ancient tool. While it was usually used to make fire, it was also used for primitive woodworking and dentistry. It consists of a bearing block or handhold , a spindle or drill , a hearth or fireboard , and a simple bow .… …   Wikipedia

• tunnels 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 …   Universalium

• Pike and shot — A 16th century pamphlet showing a mixed pike and shot formation. Pikemen are represented by the letter p , the two winges of shot by the letter o. ( H represents halberdiers.) A group of loose shotte has been pushed forward into the front of the… …   Wikipedia

• Salt Point State Park — and many others. The weather is cool with fog and cold winds even during the summer. The rocks of Salt Point are sedimentary sandstone. Due to the large amounts of sandstone, tafoni can be found along the shore of Salt Point.Cultural and natural… …   Wikipedia

• hand 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… …   Universalium

• Drilling rig — For a detailed diagram of a Petroleum drilling rig, see List of components of oil drilling rigs. Drilling rig preparing rock blasting …   Wikipedia

• Military Revolution — The Military Revolution refers to a radical change in military strategy and tactics with resulting major changes in government. The concept was introduced by Michael Roberts in the 1950s as he focused on Sweden 1560–1660 searching for major… …   Wikipedia

• List of Chinese inventions — A bronze Chinese crossbow mechanism with a buttplate (the wooden components have …   Wikipedia

• Window shutter hardware — Window Shutter Hardware> Overview A series of documents are provided here to further explain terms and terminology related to shutter hardware and blacksmithing, as well as the evolution of early hardware.A Brief History of Early Hardware In its… …   Wikipedia

• Go equipment — refers to the objects which are necessary in order to play the game of Go. Although the equipment is simple, there is a varying degree of quality and material used in making the equipment, from the economical to the extremely valuable. HistoryThe …   Wikipedia