Soule suggested a circular orientation of typebars that would converge and strike a central position , a feature that had been implemented more than 30 years earlier in a machine designed by Xavier Progin in 1833 .
Soule suggested a circular orientation of typebars that would converge and strike a central position . 
 A circular arrangement had been used more than 30 years earlier in a machine designed by Xavier Progin in 1833 .