At times, it was given the name octavin harmonique. It was also called the doublette and open flute. A few claim that it is the same as the superoctave but some object. The origins of the name of the octavin are not certain though there are some presumptions. As stated by Grove, octavin is listed as a synonym of ottavina by Venetian builders which date back from 1790. In Italy, harpsichord makers made lightweight versions with little string tension but the harpsichords were made with a heavier construction by the Ruckers family in the late 1500's. This creates a more unique and powerful tone. Flemish instruments were the basis of the harpsichord in the 18th century. Gut is a cord made from the natural fiber in the animal intestines walls. The string with the deepest note is placed farthest away from the player. These are stretched between the bridge or tailpiece and yoke. Tuning could be done by either turning the pegs where the strings were fastened or moving the string s position on the crossbar. Generally, people believe that its origins are in the Kimbereleys North East and the Northern Territory s Northern areas. In these areas, two types of eucalyptus trees are dominant which are the woollybutt and the stringybark. Traditionally, Aborigines would exchange their personal boomerangs for didgeridoos made of bamboo and wood. The term sackbut originated from the French saquer which means pull and bouter meaning push. Trompone is the Italian for sackbut and this is most probably the basis of the word trombone. At first, there were four types of trombones soprano, bass, tenor, and alto. At some period in the 19th century, trombones were constructed with valves similar to most brass instruments but this was short lived. Then, a petite gut-strung mandola called mandolino which had six strings grew in some areas in Italy. It was also referred to as a mandolin in Naples around 1735. The literature about Italian musicians who journeyed all over Europe was the source of the very first proof of the steel-string mandolins.