parallel hole drilling
21Pumpjack — Nodding donkey redirects here. For the British Rail train, see Pacer (train). Pump jack redirects here. For the Scaffold, see Pump jack. A diagram of a pumpjack. A pumpjack (nodding donkey, pumping unit, horsehead pump, beam pump, sucker rod pump …
22Butt joint — For the geometry in welding, see Butt joint (welding). A butt joint is a joinery technique in which two members are joined by simply butting them together. The butt joint is the simplest joint to make since it merely involves cutting the members… …
23Dowel — A dowel is a solid cylindrical rod, usually made of wood, plastic or metal. In its original manufactured form, dowel is called dowel rod. Dowel rod is employed in numerous, diverse applications. It is used to form axles in toys, as detents on… …
24List of Chinese inventions — A bronze Chinese crossbow mechanism with a buttplate (the wooden components have …
25Arctic Regions — ▪ 2009 The Arctic regions may be defined in physical terms (astronomical [north of the Arctic Circle, latitude 66° 30′ N], climatic [above the 10 °C (50 °F) July isotherm], or vegetational [above the northern limit of the tree line]) or in human… …
26Buchan oil field — Infobox Oil field name = Buchan oil field region = Central North Sea, South Halibut Basin country = latd = latm = lats = latNS = longd = longm = longs = longEW = locblock = offonshore = Offshore operators = Talisman Energy partners = caption =… …
27crystal — crystallike, adj. /kris tl/, n., adj., v., crystaled, crystaling or (esp. Brit.) crystalled, crystalling. n. 1. a clear, transparent mineral or glass resembling ice. 2. the transparent form of crystallized quartz. 3. Chem., Mineral. a solid body… …
28Crystal — /kris tl/, n. 1. a city in SE Minnesota, near Minneapolis. 25,543. 2. a female given name. * * * I Any solid material whose atoms are arranged in a definite pattern and whose surface regularity reflects its internal symmetry. Each of a crystal s… …
29Milling 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 …
30Metalworking — Machining a bar of metal on a lathe. Metalworking is the process of working with metals to create individual parts, assemblies, or large scale structures. The term covers a wide range of work from large ships and bridges to precise engine parts… …
