Quadratic-function ruler with dimensional data - for determining torque null points of uniformly loaded beams

摘要

Curved ruler has a boundary corresponding to a quadratic function, containing the vertex of the curve, and is printed with axially parallel lines. Preferably data are given on the dimensional ratio at which beam support widths are to be applied, and/or on the available height of uniform loading. The ruler is printed on paper or foil. More partic., the scale is for determining null points of torque with uniform loading; the torque values are printed on the long axis in dimensional ratios, with the zero value at the vertex. The directrix is parallel to the support direction of the beam which is mounted and elastically stressed on both sides. The parameter of the parabola depends on the height of the loading and on the dimensional ratio of the beam support width.