This model represents the same type of sewing machine, but fitted with a straight needle, instead of curved. The brush check is also done away with in the larger machines and an automatic take-up completes one stitch before another is begun. In later forms of the Wheeler & Wilson rotating hook its cavity is made much deeper, to accommodate a wider spool containing a large supply of under thread. In 1851 Wilson patented the rotating hook, which performed the functions of a shuttle by seizing the upper thread and throwing its loop over a circular bobbin containing the under thread.^ This simplified the construction of the machine by getting rid of the reciprocation motion of the ordinary shuttle, and contributed to make a light tool silent running machine, eminently adapted to domestic use.^ The lower bar, called the feed bar, had teeth on its upper face, and by means of a transverse sliding motion it moved the cloth, which was placed between the two bars, the desired distance, as each stitch was made.^ The feed motion was obtained by the two metal bars which are seen intersecting above the shuttle race. Wilson filed two importantpatents for Wheeler & Wilson'ssewing machines: the rotating hook and the four-motion feed.^ His first machine formed a lock stitch by means of a curved needle on a vibrating arm above the cloth plate, and a reciprocating two-pointed shuttle traveling in a curved race below the plate. Plant of the Wheeler & Wilson manufacturing companyĪllen B.
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