Will someone proofread this essay on Leonardo da Vinci?

The tank machine housed two soldiers, who propelled the machine using crankshafts. The tank was made in modern times in compliance with the original sketches by an English military team. Although the idea would have been impressive in the days of the renaissance, the modern replication of the tank fell quite short of a functional condition when built. The tank could not propel forward, and was only able to turret in spot. The tank was also completely inoperable without the adjustment of a single gear ratio. This may be an intentional design by Leonardo to prevent unqualified personnel from operating the machine, much like a key. The implementation of geared devices is paramount in Leonardo’s sketches, and he also had devised a mechanism of gear driven rotating scythes. The scythes were fixed to a gear, which in turn was driven by a shaft actuated by the rear axle of a horse drawn wagon. The scythes were meant to be rotated by the gear, much like the force of air rotates a pinwheel. Abo