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Post-classical technology

alt=An ink on paper diagram of a trebuchet. A long arm with a spherical cap rests on top of a large square platform. The square platform is supported by four plain cut square beams, which connect to an open undercarriage. Rope hangs between the end of the pole that does not have the cap to the inside of the undercarriage, as far away from the start of the rope as possible. The assembly moves on four wheels attached to the sides of the undercarriage.The

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