"William Jones (1763–1831) was an English maker of optical and other scientific instruments, who had Thomas Jefferson among his customers in London. He later formed a partnership with his younger brother Samuel Jones. W. & S. Jones were among the most successful scientific instrument makers in London during the late 18th and early 19th centuries. In 1797,Jones introduced the box sextant or ´pocket sextant´ for nautical navigation, an early marvel of mechanical miniaturisation.
W. & S. Jones published The Description and Use of a New Portable Orrery to promote their instruments and to describe their use. They worked at 135 Holborn from 1792 to 1800, and at 30 Holborn from 1800 to 1860." - (en.wikipedia.org 25.12.2019)
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