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abscissas according angle of inclination axes axis of abscissas axle base beam body calculate centimetres centre of gravity co-ordinates coefficient of friction components compression consequently contrary cord corresponding couple cross-section curve deflection denotes determined direction distance equal equation equilibrium extension feet flexure formula girder hence horizontal inches inclined plane kilograms latter length lever limit of elasticity line of gravity maximum measure mechanical effect modulus of elasticity motion neutral axis obtain ordinates parabola parallel parallelogram perpendicular point of application points of support portion pounds pressure proof load proof strength pulley resultant rolling friction rope rotation rupture solid of rotation space described substitute surface tang tangent tangential angle tension tion triangle variable velocity vertical volume weight G whence width wrought iron
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