Wardwell initiated three patents during the 1870s in the UK. The
first two were dated 1871 and 1872. His final specification,
the one illustrated, was from 1876. All three papers focussed on
his rather novel domestic treadle combination. Being mounted on
a circular plinth, the machine head could be rotated for use
at any angle. An entire standard cotton bobbin was used for
the underthread when forming a lockstitch.