Copiability

But, for business purposes, the process was impracticable on account of its non-copiability, while its manipulation was complicated and unsanitary, and the low sensitiveness of the plates required long exposure time.

Then you can tell what your signals sound like to the operator who must copy them. Speed needs to be held in check. "Copiability" is what we want. Repeats waste valuable time.

The copiability of a particular structure into another code is determined in part by the prestige of the model code and in part by 'attractive' structural properties" (Johanson 1999:60).