Possibly the most famous model Newton Wilson produced was the "Princess of Wales". During its production (1870's), it underwent various design changes.
Towards the end of its life, it was felt necessary to incorporate a facility for bobbin winding without the main mechanism of the machine being in motion (a feature becoming the norm by the 1880's). In an effort to keep the gear-driven bobbin winder, the somewhat novel "wheel within a wheel" was developed. The idea worked, of course, but it has to be looked on as a somewhat eccentric solution.

Illustrations :-

Top - shows the unmodified back wheel assembly.
Centre - shows the final incarnation clearly showing the geared brass bobbin winder in the engaged position.
Bottom - an original woodcut print of the modified version.

photos - GD Collection.

G.D.
April 99