It was an ancient war machine that acted as catapult where it was being employed in the middle ages. It was a machine that could crush the masonry made walls. It was also used mainly to projectile fire over the enemies during the wartime. Sometimes the machine was called balancing Trabuco, which was a way to distinguish it from the other weapons. It was also the most popular way when referring to revolvers or the short guns.
There was this machine that was called counterweight blunderbuss according to sinonimos.com.br. It appeared in countries where Muslims and Christians were located around the Mediterranean. The machine was very strong and could even through 140 kilos weighted projectiles and using a very high speed. It could even throw accurately 800 meters on enemy fortifications. Trabuco was invented about 400 BC in China, where they were later brought in 600 AD to European countries. The machine came at a time when they were abandoned after technology improved to bring the gunpowder.
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Trabuco ancient war machine inventions were derived from an old sling. The difference of the sling was having a small wooden piece which extended the weapon to provide better lever. This was a great evolve especially after Chinese came up with a traction bolt. This showed that a certain number of people could help in pulling the string that was attached to the arm that was short in the lever which had a sling that was over the long arm.
It was the smallest type of Trabuco, it had even small extensions but more portable for transportation according to infopedia.pt. The small beam could even be executed by one person, which was being fed by the person and the weight who would pull the single rope. Most of the machine had been designed with larger size and it required 15 to 45 men who could handle them where every two used one rope. Those men were from that local city defending their city.
Find more about Trabuco: http://www.infoescola.com/curiosidades/trabuco/