After 1800.

Brass, ivory. The case measures approx. 16.8 x 7.2 x 3.4 cm max. The length of each ivory instrument is 15.1 cm, and the width ranges from 3.4 to 4.4 cm. 333.7 g.

Historical measuring and drawing instruments in a case covered with blue-greenchagrin (stingray leather) case with a hinged lid. Inside are various instruments and attachments for the compass, as well as three ivory instruments: a proportional square, a traverse ruler, and a parallel ruler. The proportional square is marked with the manufacturer’s designation W & S Jones 30 Holborn London. The leather on the case’s lid has some age-related dry cracks.

W and S Jones manufactured mathematical and optical instruments. The company operated under various names depending on its owner; it was founded in 1776 by John Jones and, beginning in 1791 (after John Jones retired from the business due to his age), was continued by his sons and successors, William and Samuel. Around the year 1800, they moved into new business premises in the Holborn district of London. W & S Jones remained in business until 1859, when the younger brother, Samuel, died. William Jones (1762–1831) maintained a personal correspondence with Thomas Jefferson (1743–1826, third President of the United States from 1801 to 1809), which brought the company not only orders from Jefferson himself but also from other prominent figures and institutions in North America, such as Harvard University and the Lewis and Clark Expedition (1804–1806) to chart a land route to the Pacific coast. Expert report and EU trade authorization are available.