Fielding Yost, Football for Player and Spectator… (1905)
“ The proper use of the stiff arm by a runner in the open field is an acquisition which will be found well nigh invaluable to a back who is carrying the ball in a dash down the field. As the runner sees that he is about to be tackled he can suddenly shoot out his free arm, palm open, meeting the charge of the tackler with the arm stiff and rigid, often turning him aside to such an extent that he either entirely misses the tackle or is sufficiently foiled in his purpose to allow the runner to free himself without stopping and to continue on his way toward the opponents' goal. ”
