Most raw materials have varying levels of malleability, and if you bend them, you can repair the prototype with great energy. In the history of mankind, it must have been noted long ago that fruit seedlings and saplings have great flexibility in their tree skills. Since many primitive cultures and arts used this feature, a stick was inserted behind a specially made door or an iron cage, or a rod was pulled down with a loose buckle. Once the support is released, each stick or bar will bounce back. This is how they catch birds and animals. The bow, in fact, is the malleable torsion spring of a young tree in this way; Draw the bow back, then let it go and let it bounce back. In Europe in the Middle Ages, such ideas began to appear in mechanical devices such as textile machines, CNC lathes, drilling machines, grinding machines and saws. The operator uses force or treadle to achieve four strokes of diastolic pressure to pull down the working machine. At this time, a rod fixed to the machine with a rope springs back, causing repeated motion.

The torsional resistance of a malleable material does not outweigh its flexural resistance. The Greek Empire period (around the 4th century AD) created the use of kneaded tendon or wool rope taut mold, simple yellow to enhance the crossbow and trebuchet lethality. It was just beginning to be understood that metals are much more malleable than wood, or cuticle, or any of these organic chemical chemicals. Philo (who wrote about 200 AD) describes it in detail as a quest and discovery. He calculated that the audience was unimaginable. The Lakers' and Espanyol's sword's malleability caused his Alexandria old-timers to take note. To better understand why the sword was malleable, they carried out a number of experiments. As a result, his old master, Cortesibi, invented the trebuchet, whose elastic yellow was made of bent bronze plates -- in fact, the original compression spring; Philo himself improved the trebuchet further. After creating this type of trebuchet, the creative Ketsibi came up with another trebuchet - one that used the elastic operation of the gas in the cylinder under pressure.

It was not until much later that it was remembered that if a spiral bar were shrunk, rather than a straight one bent, metal materials would store more kinetic energy. According to a biography of Boruseleski, he made an alarm bell in which he used a mold spring to customize several generations of elastic. Some have recently highlighted a sample of this alarm in a mechanical manual of the late 15th century with some distinctive spiral single-spring clocks and watches. These saucers are also used in modern mousetraps. Clocks with ring springs (air-elastic yellow with a narrowing level rather than a narrowing vertical one) were no doubt in use around 1460, but were mostly royal handbags, and it took another century or so for clocks with a bouncing yellow to become a sign of the middle class.