Samuel Blatchford

“ Double-pointed staples, with a diagonal cut on each point, but the diagonal cut on one point on the upper and outer side, and on the other point on the lower and outer side, as the staple was driven, were old. They were used to secure wire screens as guards for windows. The effect in driving them was to bring the two points together, by throwing them towards each other, through their movements in opposite directions. The mechanical action embodied was the forcing each point, in being driven, in a direction away from its bevel or cut. ”