Bore (wind instruments)

The bore of a wind instrument is its interior chamber that defines a flow path through which air travels and is set into vibration to produce sounds. The shape of the bore has a strong influence on the instrument's timbre.

Bore shapes

The cone and the cylinder are the two idealized shapes used to describe the bores of wind instruments. These shapes affect the harmonics associated with the timbre of the instrument. The conical bore has a timbre composed of odd and even harmonics, while the closed cylindrical bore or closed tube is composed primarily of odd harmonics. The harmonic characteristics of instruments such as the clarinet (closed cylinder) are more variable than a given waveform and bore alone is not the only determining factor. The timbre of a clarinet, for instance, mainly depends on the construction of the mouthpiece and the properties of the reed. Furthermore, minute changes in air pressure and pressure applied to the reed (vibrato, slurs) modulate the tone.

Bore (woreda)

Bore is one of the woredas in the Oromia Region of Ethiopia. Part of the Guji Zone, Bore is bordered on the south by Ana Sora, on the west by the Uraga, and on the north and east by the Southern Nations, Nationalities, and Peoples Region. The largest town in Bore is Bore.

Overview

The altitude of this woreda ranges from 1800 to 2900 metres above sea level; Mount Sutaa being the highest mountain in the district is only 6 km from Bore town. Main rivers include the Gannaalee and Buqqisaa,. Before the split, notable local landmark is the Me'ee Bokkoo, next the main road to Boonbaa. This is an open field kept clear of large trees but covered with grass, and except for grazing cattle no agricultural activity is permitted there. It is considered a sacred place to the local Oromo, for it is designated where the traditional leader known as Abba Gadaa convenes the tribal assembly. A survey of the land in this woreda shows that 29% is arable or cultivable (20.9% was under annual crops), 33% pasture, 30% forest, and the remaining 8% is considered swampy, degraded or otherwise unusable. Barley, wheat, corn, teff, and horse bean are important crops. False banana, " Weesii" is widely planted and used in every day consumption.Coffee is also an important cash crop; between 20 and 50 square km are planted with it.

.410 bore

.410 bore, commonly incorrectly named the .410 gauge, is the smallest gauge of shotgun shell commonly available. It has similar base dimensions to the .45 Colt revolver cartridge, though the .410 is significantly longer, up to 3 inches (76 mm), allowing many single-shot firearms and some revolvers chambered in that caliber to fire shot without any modifications.

Origin

Lancasters pattern centrefire and pinfire .410 shot cartridges first appear in Eley Brothers Ltd. advertising flysheets in 1857. By 1874 Eleys were advertising modern centrefire .410 cartridges. It appears to have become popular around 1900, although it was recommended as "suited to the requirements of naturalists, and for such weapons as walking-stick guns", presumably for self-defense, in 1892 by W. W. Greener. The first ammunition was two inches (50.8 mm) long, compared with the modern 2.5 and 3.0-inch (76 mm) sizes.

Uses

As the smallest of traditional shotgun sizes, .410 bore guns throw the least weight of shot, but are very easy to handle. This results in a very low recoil, so the .410 is often chosen for young shooters, who might have problems with a heavier recoiling shotgun. Some shooters, however, discourage the use of the .410 as an introduction for young shooters, both because the negligible recoil does not familiarize the beginners with the heavier recoil of larger cartridges such as the 12 gauge, and because of the difficulty in hitting moving targets with the small charge of shot used by the .410. Others believe starting young/new/small shooters with large recoiling guns will cause a habit of flinching and negatively affect their accuracy.

Libra

Libra may refer to:

Science and technology

Entertainment

Other

Libra (Gary Bartz album)

Libra is the debut album by saxophonist Gary Bartz' Quintet recorded in 1967 and released on the Milestone label.

Reception

Michael G. Nastos of Allmusic said "Featured are excellent compositions and playing in mainstream mode... This is the more lyrical side of Bartz".

Track listing

All compositions by Gary Bartz except as indicated

Personnel

References

Libra (DC Comics)

Libra is a fictional character, a supervillain appearing in comic books published by DC Comics. He first appeared in Justice League of America #111 (May-June 1974), where he formed the first incarnation of the Injustice Gang (though there had been other villain groups with similar names, like the Injustice Society and the Injustice League). Libra made his return with a leading role in Final Crisis in 2008.

Publication history

Libra's only major appearance, prior to his appearance in Final Crisis, was in Justice League of America #111–112, in 1974. In 2004, he made a brief cameo in the JLA/Avengers crossover (#4) by Kurt Busiek and George Pérez.

Grant Morrison, the writer of Final Crisis, explained the reason for picking an obscure villain:

In May 2008, his appearances were reprinted in DC Universe Special: Justice League of America at the same time as he was reintroduced, along with the Human Flame (a Martian Manhunter foe who appeared in Detective Comics #274), in Justice League of America #21. He returns, apparently retaining the full might of his godlike status, to lead a new and final incarnation of the Secret Society of Super-Villains, this time offering to every villain, from simple costumed crooks to major ones, the realization of his/her fondest wish.