With the assistance of his friend Carlos Glidden, Sholes invented a numbering machine, which Glidden later suggested should be converted to a lettering machine.

• 他的助手和朋友是卡洛斯.；格莱顿，他发明了多种打字机，并提出了转换字体（也就是后来打字机的大小写）的想法，并为此制作了大约30多种打字机。