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Что (кто) такое core bit - определение
![An oriented core [[goniometer]], commonly used when analyzing cores for contacts and other structural features](https://commons.wikimedia.org/wiki/Special:FilePath/Oriented Core Goniometer commonly used when logging core.JPG?width=200 "An oriented core [[goniometer]], commonly used when analyzing cores for contacts and other structural features")
![A 10.8×10.8 cm plane of magnetic core memory with 64 x 64 bits (4 Kb), as used in a [[CDC 6600]]. Inset shows ''word line'' architecture with two wires per bit](https://commons.wikimedia.org/wiki/Special:FilePath/Ferrite core memory.jpg?width=200 "A 10.8×10.8 cm plane of magnetic core memory with 64 x 64 bits (4 Kb), as used in a [[CDC 6600]]. Inset shows ''word line'' architecture with two wires per bit")
![[[Project Whirlwind]] core memory](https://commons.wikimedia.org/wiki/Special:FilePath/Project Whirlwind - core memory, circa 1951 - detail 1.JPG?width=200 "[[Project Whirlwind]] core memory")
![Diagram of the [[hysteresis]] curve for a magnetic memory core during a read operation. Sense line current pulse is high ("1") or low ("0") depending on original magnetization state of the core.](https://commons.wikimedia.org/wiki/Special:FilePath/Ringkernspeicher hysteresekurven.agr.svg?width=200 "Diagram of the [[hysteresis]] curve for a magnetic memory core during a read operation. Sense line current pulse is high (\"1\") or low (\"0\") depending on original magnetization state of the core.")
![This [[microSDHC]] card holds 8 billion bytes (8 GB). It rests on a section of magnetic-core memory that uses 64 cores to hold eight bytes. The microSDHC card holds over one billion times more bytes in much less physical space.](https://commons.wikimedia.org/wiki/Special:FilePath/8 bytes vs. 8Gbytes.jpg?width=200 "This [[microSDHC]] card holds 8 billion bytes (8 GB). It rests on a section of magnetic-core memory that uses 64 cores to hold eight bytes. The microSDHC card holds over one billion times more bytes in much less physical space.")
![US quarter]] for scale](https://commons.wikimedia.org/wiki/Special:FilePath/Magnetic-core memory, 18x24 bits.jpg?width=200 "US quarter]] for scale")
![A diagram showing how manipulating the least significant bits of a color can have a very subtle and generally unnoticeable affect on the color. In this diagram, green is represented by its [[RGB]] value, both in decimal and in binary. The red box surrounding the last two bits illustrates the least significant bits changed in the binary representation.](https://commons.wikimedia.org/wiki/Special:FilePath/LeastSignificantBitDemonstration.jpg?width=200 "A diagram showing how manipulating the least significant bits of a color can have a very subtle and generally unnoticeable affect on the color. In this diagram, green is represented by its [[RGB]] value, both in decimal and in binary. The red box surrounding the last two bits illustrates the least significant bits changed in the binary representation.")
Википедия
A modern core drill is a drill specifically designed to remove a cylinder of material, much like a hole saw. The material left inside the drill bit is referred to as the core.
Core drills used in metal are called annular cutters. Core drills used for concrete and hard rock generally use industrial diamond grit as the abrasive material and may be electrical, pneumatic or hydraulic powered. Core drills are commonly water cooled, and the water also carries away the fine waste as a slurry. For drilling masonry, carbide core drills can be used, but diamond is more successful when cutting through rebar.
The earliest core drills were those used by the ancient Egyptians, invented in 3000 BC. Core drills are used for many applications, either where the core needs to be preserved (the drilling apparatus used in obtaining a core sample is often referred to as a corer), or where drilling can be done more rapidly since much less material needs to be removed than with a standard bit. This is the reason that diamond-tipped core drills are commonly used in construction to create holes for pipes, manholes, and other large-diameter penetrations in concrete or stone.
Core drills are used frequently in mineral exploration where the coring may be several hundred to several thousand feet in length. The core samples are recovered and examined by geologists for mineral percentages and stratigraphic contact points. This gives exploration companies the information necessary to begin or abandon mining operations in a particular area.
Before the start of World War Two, Branner Newsom, a California mining engineer, invented a core drill that could take out large diameter cores up to 16 feet in length for mining shafts. This type of core drill is no longer in use as modern drill technology allows standard drilling to accomplish the same at a much cheaper cost.
Core drills come with several power choices including electric, pneumatic, and hydraulic (all of which require power sources, such as a generator).
