[1] Tensile and compressive forces in a planar central force system based on the example of a crane jib [2] Various jib forms possible [3] Integrated spring balances in the bars [4] Max. load on crane jib 50N [5] Loading with weights set, up to 50N [6] Steel weights, surfaces galvanised [7] Stainless steel retaining bar [8] Sturdy metal frame [9] Handles to aid transportation [10] Box to house the components |