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The "bell-clapper deformity," in which there is inappropriately high attachment of the tunica vaginalis over the spermatic cord and failure of the normal posterior attachment of the testicle to the inner scrotum, which allows the testicle to move freely within the tunica vaginalis and predisposes to intravaginal testicular torsion. [2]
In this case, the bell will catch up with the clapper and if rung to or near full circle will carry the clapper up on the bell's trailing side. Alternatively, the clapper may have a shorter period and catch up with the bell's leading side, travel up with the bell, and come to rest on the downhill side.
Historically, a bell would be rung on three occasions around the time of a death. The first was the "passing bell" to warn of impending death, followed by the death knell which was the ringing of a bell immediately after the death, and the last was the "lych bell", or "corpse bell" which was rung at the funeral as the procession approached the church. [1]
If the bell is mounted as cast, without any tuning, it is called a "maiden bell". Russian bells are treated in this way and cast for a certain tone. [11] Cutaway drawing of a bell, showing the clapper and interior. The profile of the bell thickness can be seen, and is thickest at soundbow near the bottom (the lip).
Within the bell is a clapper which consists of a solid shaft, (wood, iron or steel) a clapper ball (wrought iron or steel) and a flight. The size of the flight determines the rate at which the clapper swings, and therefore the point in time at which it strikes the bell. Bells are normally left mouth down (for safety).
[10] A heavy clapper brings out lower partials (clappers often being about 3% of a bell's mass), while a higher clapper velocity strengthens higher partials (0.4 m/s being moderate). The relative depth of the "bowl" or "cup" part of the bell also determines the number and strength of the partials in order to achieve a desired timbre.
The zangak is hemispherical, has a small iron clapper and is made in different pitches. The zangak is otherwise not used in Armenian music. [24] Zang, bracelet of bells from Uzbekistan. The zang-i kaftar ('dove bell') is a pair of ring-shaped jingles tied together on a short string and used in light music in northern Afghanistan. A clamp with a ...
The clapper on an English handbell is on a hinge and moves back and forth in a single direction, unlike a school bell in which the clapper swings freely in any direction. It also has a spring that holds the clapper away from the casting after the strike to allow the bell to ring freely.