The AR-15s light weight, accuracy, and light recoil has made it extremely popular with shooters and its use is spreading around the world. It is a useful collector's item, ranch or home secuity rifle, and small caliber hunting rifle and has become one of the most popular rifles in the world, and ArmaLite's are manufactured even today.
Timpani
Timpani (sometimes called kettle drums) are drums that are made out of large bowls that are usually made of copper shaped by craftsmen, which after being tuned, have a skin-like material stretched over the top. This material used to be a type of vellum or treated skin, but modern drums use a synthetic material. This top section is known as the "drumhead".
"Timpani" is an Italian word. It is also a plural of the word "timpano". However "timpano" is rarely used in informal English. More often, a timpano is referred to as a "drum", a "timpani", or simply a "timp". Someone who plays a timpani is called a "timpanist".
Timpani are different from other drums because they are tuned to certain musical notes. A timpanist will often describe the drum as being "in voice" (or out of voice, as the case may be) when it is correctly tuned. To play it, it is hit with a special drumstick or "timpani mallet". Other drums that are used in orchestras and bands make a sound rather than a note, and are not tuned. A player normally sits with a group of two, three or four timpani around him, which is why the name timpani is in the plural.
Timpani were originally used in official bands. They can still be seen in the bands of the modern official as in the Household Cavalry of Queen Elizabeth II of the United Kingdom, in which the "kettle drums" (as they are called) are carried by large drumhorses. In the 1700s timpani became popular in orchestral music, and can be heard in the music of Handel, Beethoven and other 19th century composers wrote music that needed the timpani. Nowadays all large orchestras have timpani, and some bands that play popular music use them as well.
A timpani drumhead, also called a timpani head, can be made out of two different things. Some are made out of animal skin, like calfskin or goatskin. Other ones can be made out of thick plastic. Because plastic heads are hard to break and do not cost as much as animal skin heads, they are used more often than animal skin heads. However, a lot of professional players prefer skin heads because they think that skin heads make a better sound when they are hit. The drumhead is stretched over the bowl of the timpani and held on by screws for tuning the timpani.
The screws that hold and tune the drumhead are called "tension rods". To tune the timpani, the "tension rods" can all be tightened or loosened. The timpani makes a higher sound if the tension rods are made tighter, and a lower sound if they are loosened. There are usually around seven tension rods on the timpani.
Tuning a timpani by turning every tension rod by itself can be very hard, so some timpani makers invented different ways to change the drum's pitch more quickly.
In a chain timpani, the tension rods are all attached to a chain. This chain is hooked up to a lever, and when a player moves the lever back and forth, it tightens and loosens all the screws at the same time to change the pitch of the drum.
A pedal timpani is a timpani that uses a pedal to change its pitch. It is the kind of timpani that is used the most today. A player can push on the pedal to make the timpani play higher notes, or let the pedal come back up to play lower notes. There are three different kinds of pedal timpani:
Timpani are played with a special kind of drumstick called "timpani mallets". A player uses two mallets at a time when they play the drum. The two parts of the mallet are called the "shaft" and the "head". The head is the part of the mallet that is shaped like a circle, and is the part that hits the timpani, and the shaft is the wooden part of the mallet that is held by a timpanist. A timpani mallet's head can be made out of many things, but is usually made out of a wood sphere that is covered with felt or a thin cloth. The shaft of the mallet is usually made out of wood, like hickory, cherry, or bamboo, but can also be made out of metal, like aluminum. Some timpani mallets do not have a felt head, and just have a wooden one. These mallets are sometimes used in classical and baroque music.
In the beginning of the 20th century, some mallets had shafts made out of whale bones and heads made out of sponges.
With a pedal timpani, a player can produce different sound effects using the pedals. Performing glissando on timpani demands switching the pedals. Glissando is generated by pressing the pedal during the vertebra. Furthermore it is possible to play glissando at any volume level up or down. For example, Alexander Rahbari, an outstanding Iranian-Austrian composer used glissando effect produced by switching timpani pedals in the opening of his piece, Persian Mysticism Around G, where the player moves from Bb up to C and then rolling down to G(see the timpani part on right below).
Hurricane Lorenzo (2007)
Hurricane Lorenzo was the twelfth named storm and fourth hurricane of the 2007 Atlantic hurricane season. It formed in the Bay of Campeche off the east coast of Mexico where it quickly strengthened into a hurricane. It made landfall in central Mexico early on September 28 as a Category 1 hurricane.
On September 21, an area of convection formed in the western Caribbean Sea associated with a trough of low pressure. Convection increased and a wide area of low pressure formed on September 22 as the convection moved northwestward towards the Yucatan Peninsula. On September 23 the area of low pressure moved over the Yucatan Peninsula and was creating thunderstorms from the southern Gulf of Mexico to the northwestern Caribbean Sea. Over the next few days the large area of low pressure was moving unevenly over the southwestern Gulf of Mexico, but convection was restricted from strong upper-level winds. By September 25 upper-level winds started decrease as conditions became more favorable for tropical cyclone formation and by that morning visible satellite imagery showed that a tropical depression could be forming about 180 mi (290 km) east of Tampico, Tamaulipas.
During the evening of September 25 a United States Air Force Hurricane Hunter aircraft found that the area of low pressure had turned into a tropical depression. The depression tracked slowly to the south and southwest into the Bay of Campeche. On September 26, convection increased and the depression was getting closer to strengthening into a tropical storm. At 0300 UTC September 27 the Government of Mexico gave out a tropical storm watch for parts of the Mexican Gulf Coast as the depression was predicted to strengthen into a tropical storm. The depression began to quickly strengthen on September 27, and the depression became Tropical Storm Lorenzo around midday. Continued strengthening that afternoon brought Lorenzo to hurricane strength, less than seven hours after being named. Lorenzo made landfall in central Mexico south-southwest of Tuxpan as a Category 1 hurricane with 80 mph winds on the Saffir-Simpson Hurricane Scale. Lorenzo dissipated later that afternoon as the final advisory was given out.
A tropical storm warning was given out for the central Mexican Gulf Coast on September 26. When Lorenzo began to rapidly strengthen, the warning was raised to a hurricane warning. Mexico's Civilian Protection officials declared a "red alert" for much of the state of Veracruz.
At first, no evacuations were given out right away, as a result of the up-coming start of Lorenzo, although shelters were set up in the state of Veracruz and officials cancelled classes at all local schools. Because of the fast development of the storm though, officials quickly evacuated over 100,000 people just before landfall by using bullhorns on the streets warning people of the up-coming threat.