For whatever reason, Oughtred failed to publish news of his invention, but one of his students, Richard Delamain, claimed in a 1630 pamphlet to have come up with the circular slide rule.

• 因为某些原因，奥特雷德没有公开发表他的发明，但他的学生德莱门（RichardDelamain）于1630年在一份小报上宣称他发明了圆形计算尺。