517. Experiments.

A description is insufficient if undue experimentation is required1. Trials to ascertain the best working conditions or to arrive at a successful result may be a necessity2, but there must be sufficient directions for the competent reader of the specification to know what trials to make and how to perform them3. In particular, where the invention claimed is defined by words of degree, or in terms of the result to be achieved, the instructions must enable the reader, over the whole width of the claim, to obtain success with the aid of simple experiments only