Cecil Weatherly, 1911 Encyclopædia Britannica (1911)
“ The “snafile" for the riding horse has a smooth jointed steel mouthpiece, with straight cheek-bars, the rings for the reins and cheek-pieces of the headstall being fixed in the bars at the junction with the mouthpiece. A severer snaffle has the mouthpiece twisted and fluted. The bars prevent the horse pulling the bit through the mouth. ”
