- Launhardt found that, for stresses always of the same kind, F = (t-u)/(t-fmax.) approximately agreed with experiment.
- Launhardt, based on an empirical expression for Wohler's law, has been much used in bridge designing (see Proc. Inst.
- The following table gives values of the working stress calculated by these equations: Working Stress for Tension or Thrust by Launhardt and Weyrauch Formula.