One of Henry's key inventions was the concept for a 'Bobbin-Free' sewing machine. The goal of such a machine was to simplify sewing and reduce the need for frequent bobbin changes. She also developed the double chain stitch sewing machine.

Besides the 'Bobbin-Free' sewing machine concept, Henry likely worked on other improvements related to sewing machine mechanisms. Exact dates and specifics of these inventions are not readily available but reflect a dedication to enhancing textile technologies.