Bill Tindall, E.Tn.
Note that there is no discussion of researching what abrasive to use on hard steel. As a result he set people on a path of choosing the wrong abrasive for the task. And, as a result they found poor abrasive life in the coarse grits. And perhaps abandoned a technique that could have been desirable.

Why am I thinking this person was 20-30 years old at the time.