R. Austin Freeman, The Aluminum Dagger (1910)
“ Thorndyke remained silent for a while, pacing slowly along the gravel path, with his eyes bent on the ground—-not abstractedly, however, but with a searching, attentive glance that roved among the shrubs and bushes as if he were looking for something." "What sort of man," he asked presently, "is this Leonard Wolfe? Obviously he is a low scoundrel, but what is he like in other respects? Is he a fool, for instance?" "Not at all, I should say," said Mr. Curtis. "He was formerly an engineer, and, I believe, a very capable mechanician. ”
