Large elevators, in fact, are the same as the principle of the lifting workbench of later generations, but this era certainly cannot build a hydraulic lift, so only a triangular support with a height of six zhang can be built, just one zhang higher than the ordinary city wall now, and the lower end is also installed with a frame and shield that can be pushed and moved by soldiers, and then the upper end is installed with pulleys to make a lifting box, which can hide ten crossbowmen, and the outside is wrapped by iron sheets, leaving a shooting port, which can be ...... when attacking the city

Chapter 51 of "The First Horse of Great Qin" My own team is in the middle of the fight, please wait a while,

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