delta drill!

delta drill

Comprehensive Analysis

1) "Delta" -- As to delta drill 1del·ta Pronunciation: 'del-t& Function: noun Etymology: Middle English deltha, from Greek delta, of Semitic origin; akin to Hebrew dAleth daleth 1 : the 4th letter of the Greek alphabet -- see ALPHABET table 2 : something shaped like a capital Greek delta; especially : the alluvial deposit at the mouth of a river 3 : an increment of a variable -- symbol Δ 4 : DELTA WAVE - del·ta·ic /del-'tA-ik/ adjective Pronunciation Symbols Delta may refer to: 1 Abbreviations 2 People 3 Places Delta (letter), the letter Δ or δ in the Greek alphabet, also used as a mathematical symbol. In astronomy: In Bayer designation, one of the stars in a constellation (e.g., Delta Cygni) In aeronautics: A delta wing The Delta family of launch vehicles In the Earth sciences: River delta, deposit at the mouth of a river that resembles the shape of Δ Tropical Storm Delta (2005) In mathematics and computer science: Δ often denotes a difference; δ can represent a small change or amount. In elementary set theory and Boolean algebras, Δ usually denotes the symmetric difference An inverted delta (), known as del or nabla, is used as a vector differential operator. The Kronecker delta, a function of two variables which is 1 when they are equal The Dirac delta function, a distribution used as an approximation for a spike function Delta encoding, a technique in computer communications and version-control In formal fuzzy logic, Δ denotes a unary connective representing the full truth of a proposition (often called Baaz Delta connective) In mathematical finance one of the Greeks used in option and derivatives pricing representing the rate of change of the option price with respect to changes in the underlying price Companies and products: Delta Air Lines, a major U.S. airline Delta (computer), a Russian ZX Spectrum clone Delta Environmental Consultants, an environmental remediation company based in St. Paul, Minnesota ..." 2) "Drill" -- As to delta drill 1drill Pronunciation: 'dril Function: verb Etymology: Dutch drillen transitive verb 1 a : to fix something in the mind or habit pattern of by repetitive instruction <drill pupils in spelling> b : to impart or communicate by repetition <impossible to drill the simplest idea into some people> c : to train or exercise in military drill 2 a (1) : to bore or drive a hole in (2) : to make by piercing action <drill a hole> b : to shoot with or as if with a gun c (1) : to propel (as a ball) with force or accuracy <drilled a single to right field> (2) : to hit with force <drilled the batter with the first pitch> intransitive verb 1 : to make a hole with a drill 2 : to engage in an exercise - drill·abil·i·ty /"dri-l&-'bi-l&-tE/ noun - drill·able /-l&-b&l/ adjective - drill·er /'dri-l&r/ noun Pronunciation Symbols A child using an electric drill with a screwdriver bit mounted in the chuck. A drill is a tool with a rotating drill bit used for drilling holes in various materials. Drills are commonly used in woodworking and metalworking. The drill bit is gripped by a chuck at one end of the drill, and is pressed against the target material and rotated. The tip of the drill bit does the work of cutting into the target material, slicing off thin shavings (twist drills or auger bits) or grinding off small particles (oil drilling). 1 History 2 Types 2.1 Hand tools 2.2 Electric Drill 2.3 Hammer Drill 2.4 Rotary hammer drill 2.5 Cordless drills 2.6 Drill press 2.7 Geared head drill 2.8 Radial arm drill 2.9 Mill drill 3 Related tools 4 See also 5 References The earliest drills were probably bow drills. The invention of the electrical drill is credited to Arthur James Arnot[1], in 1889, at Melbourne, Australia. Wilhelm Fein[2] invented the portable electric drill in 1895, at Stuttgart, Germany. In 1917, Black & Decker patented a trigger-like switch mounted on a pistol-grip handle.[3] There are many types of drills; some powered by hand and others using electricity or compressed air as the motive power. Drills with a percussive action (such as hammer drills, jackhammers or pneumatic drills) are usually used in hard materials such as masonry or rock. As well, drilling rigs are used to bore holes in the earth to obtain water or oil. An oil well, water well, or holes for geothermal heating are created with large drill rigs up ..." 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