So, what kind of adaptation did he decide to build for long-range shooting? The basis was taken late Roman ballista for shooting stones. The frame was made from well-dried oak blanks. The front frame was small and had two bronze bodies for toning on the sides, which were equipped with a guide for levers and a window for estimating the tension. In the upper part of the body was an adjusting mechanism in the form of an asterisk, fixed by a pawl with a hole for the lever. All thirty steps of tone there perfectly fit. The support frame was equipped with a rather long guide groove for the projectile - it went beyond the tones for the length of the arm. The platoon system represented a somewhat modified form of the English gate, arranged with the enlarged shape of the crossbow lock. The shot was made by pressing the trigger handle toward you. The peculiarity of the modification was that instead of a block of wheels, a pair of two massive bronze gears used as a reduction gear with a ratio of 1 to 8 was used. Such a solution made it possible to excavate this unit without any special effort. The twin block was needed in order for the gear to be engaged at both ends of the shaft in order to avoid distortions and excessive loads. As a safety fuse, two dogs were used, which blocked both large gears from turning in the wrong direction. The speed of the cocking was very solid. The working stroke of the bowstring with a swing of the levers, with a frame of one hundred and fifty centimeters, was a meter. After the tests, the result was about six hundred kilograms. Which was even better than planned. The last stroke of the design was a wheeled machine on two light wheels of large diameter. For that time, the combination of the bushing with the rim and spokes gave a unique result in relation to the lightness of the wheel strength. The rim itself was reinforced with a strong iron stripe. In order to simplify transportation, it was decided to refine the traditional design by introducing a charging box, to which it was possible to attach a horse harness. The charger itself was equipped with a compartment for four spare tones, a set of repair and adjustment tools, some spare parts and a compartment for two hundred cores five centimeters in diameter. The charger box, like the ballista, was installed on the same light, dial-up wheels. A spare tire was attached to its front cover. A place for the charioteer is not provided. The fact is that the whole structure was very light, and therefore the harness included a saddle, allowing the driver to ride on horseback if necessary. In combat conditions, even one person could cope with the design, but the staff was supposed to be allocated to each ballista on the group. Ballistic and operational tests, which took place in February, showed that with a flat shot, this device can effectively hit the enemy, defended by mail and aketon, at distances of up to two hundred and fifty steps. At the same time, accuracy was maintained at a distance of up to a hundred steps, with a maximum range of up to four hundred meters, on which a good traumatic effect still remained. Separately, it should be said that from a distance of about a hundred paces the core was pierced with a shield of pine boards six centimeters thick. The rate of fire was about one shot per minute. The weight of the ballistae with a machine without a charger is about one hundred and fifty kilograms. The main percentage of weight, of course, went to the shells of the tonus and the mechanism of the platoon. The only significant drawback of the design was that on average after ten shots it was required to check the adjustment and tension of the tonus. Otherwise, accuracy and range of fire began to fall sharply. In general, the tonus of such a manufacture, after the tests, stood about four hundred shots, after which they fell into disrepair. Not so bad. To protect the servicemen, Eric wanted to install two protective shields, but experiments showed the failure of this solution, since it seriously heaved the design, and also reduced its rigidity. In general, having carried out comprehensive tests of the prototype, laid four new, taking into account all the deficiencies in the design, identified in the process of active operation. Of course, the existing sample was dismantled, and its bronze pieces went to one of the ballistic twins.