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Ad 4 to 48 Sheaves. Many war machines used in the defense of Syracuse compound pulley systems planetarium water screw possibly water organ possibly burning mirrors. Engineering Formula Sheet Mechanical Advantage Engineering Notes Physics Concepts (source : pinterest.com) Ad 4 to 48 Sheaves. Compound pulley systems . Advantage compound pulley systems the concept of throw self-adjusting brakes range of system throw internal versus external pulling systems and the 120o rule. The 51 is a 31 Z-drag and 21 system. By pulling down on the string on the right the lower pulley rises. The 41 piggy-back is a 21 pulling on a 21 system see Figure 9. We would use the tension of the rope on each side of the pulley. Discounting small frictions in the pulley and rope the tension is the same throughout the rope. Here is one way of accomplishing that with a compound pulley. This setup uses two pulleys. Compound Pulley Systems These are pulley systems where one pulley system is pullin...