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  • Gibbeting

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    See also Halifax gibbet, a kind of guillotine.The reconstructed gallows-style gibbet at Caxton Gibbet, in Cambridgeshire, England A gibbet is any instrument of public execution (including guillotine, executioner's block, impalement stake, hanging gallows, or related scaffold), but gibbeting refers to the use of a gallows-type structure from which the dead or dying bodies of criminals were hung on public display to deter other existing or potential criminals. Occasionally the gibbet was also used as a method of execution, with the criminal being left to die of exposure, thirst and/or starvation. The term gibbet may also be used to refer to the practice of placing a criminal on display within a gibbet. This practice is also called "hanging in chains".

  • Gun safe

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    An example (open and closed) of a typical gun safe. A gun safe is a safe for one or more firearms and/or ammunition for those guns. Gun safes are primarily used to prevent access to unauthorized or unqualified persons, for burglary protection, and, in more capable safes, to protect the contents from damage during a flood, fire, or natural disaster. Access prevention is required by law in many places, necessitating a gun lock, metal gun cabinet, or gun safe. Gun safes have largely replaced the gun cabinets made of fine stained wood with etched glass fronts used for display that were commonly used decades ago, although some gun safes are made to resemble such gun cabinets.

  • Phase-locked loop

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    Simplest analog phase locked loop A phase-locked loop or phase lock loop (PLL) is a control system that generates an output signal whose phase is related to the phase of an input signal. There are several different types; the simplest is an electronic circuit consisting of a variable frequency oscillator and a phase detector in a feedback loop. The oscillator generates a periodic signal, and the phase detector compares the phase of that signal with the phase of the input periodic signal, adjusting the oscillator to keep the phases matched. Keeping the input and output phase in lock step also implies keeping the input and output frequencies the same. Consequently, in addition to synchronizing signals, a phase-locked loop can track an input frequency, or it can generate a frequency that is a multiple of the input frequency. These properties are used for computer clock synchronization, demodulation, and frequency synthesis. Phase-locked loops are widely employed in radio, telecommunications, computers and other electronic applications.

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