Snare drum

The snare drum or side drum is a ubiquitous percussion instrument known for its shallow cylindrical shape and powerful, staccato sound. Snare drums are often used in orchestras, concert bands, marching bands, parades, drumlines, drum corps, and more. It is one of the central pieces in a trap set, a collection of percussion instruments designed to be played by a seated drummer, which is used in many popular genres of music. Snare drums are usually played with drum sticks, although there are other options which create a completely different sound, such as the brush.

The snare drum originates from the tabor, a drum first used to accompany the flute. The tabor evolved into more modern versions, such as the kit snare, marching snare, tarol snare, and piccolo snare. Each type presents a different style of percussion and size. The snare drum that one might see in a concert is usually used in a backbeat style to create rhythm. In marching bands, it can do the same but is used mostly for a front beat.

Percussion instrument

A percussion instrument is a musical instrument that is sounded by being struck or scraped by a beater (including attached or enclosed beaters or rattles); struck, scraped or rubbed by hand; or struck against another similar instrument. The percussion family is believed to include the oldest musical instruments, following the human voice.

The percussion section of an orchestra most commonly contains instruments such as timpani, snare drum, bass drum, cymbals, triangle and tambourine. However, the section can also contain non-percussive instruments, such as whistles and sirens, or a blown conch shell. On the other hand, keyboard instruments, such as the celesta, are not normally part of the percussion section, but keyboard percussion instruments such as the glockenspiel and xylophone (which do not have piano keyboards) are included.

Percussion instruments are most commonly divided into two classes: Pitched percussion instruments, which produce notes with an identifiable pitch, and unpitched percussion instruments, which produce notes or sounds without an identifiable pitch.

Percussion cap

The percussion cap, introduced circa 1820, was the crucial invention that enabled muzzleloading firearms to fire reliably in any weather. This gave rise to the caplock or percussionlock system.

Before this development, firearms used flintlock ignition systems that produced flint-on-steel sparks to ignite a pan of priming powder and thereby fire the gun's main powder charge (the flintlock mechanism replaced older ignition systems such as the matchlock and wheellock). Flintlocks were prone to misfire in wet weather, and many flintlock firearms were later converted to the more reliable percussion system.

The percussion cap is a small cylinder of copper or brass with one closed end. Inside the closed end is a small amount of a shock-sensitive explosive material such as fulminate of mercury. The percussion cap is placed over a hollow metal "nipple" at the rear end of the gun barrel. Pulling the trigger releases a hammer that strikes the percussion cap and ignites the explosive primer. The flame travels through the hollow nipple to ignite the main powder charge. Percussion caps were, and still are, made in small sizes for pistols and larger sizes for rifles and muskets.

Percussion (disambiguation)

Percussion may refer to:

Snare

Snare may refer to:

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This is a list of Decepticons from the Transformers fictional universe and toyline.

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Snare (software)

Snare (sometimes also written as SNARE, an acronym for System iNtrusion Analysis and Reporting Environment) is a collection of software tools that collect audit log data from a variety of operating systems and applications to facilitate centralised log analysis. Enterprise Agents are available for Linux, OSX, Windows, Solaris, Microsoft SQL Server, a variety of browsers, and more. Snare Enterprise Epilog for Windows facilitates the central collection and processing of Windows text-based log files such as ISA/IIS. Snare Enterprise Epilog for Unix provides a method to collect any text based log files on the Linux and Solaris operating systems. Opensource Agents are available for Irix and AIX.

Snare is currently used by hundreds of thousands of individuals and organisations worldwide to meet local and federal information security guidelines associated with auditing and eventlog collection.

History

The Snare series of agents began life in 2001 when the team at InterSect Alliance created a Linux kernel module to implement Trusted Computer System Evaluation Criteria auditing at the C2 level.