Set includes brass sector, square, and protractor with matching signatures “Langlois a Paris aux Galeries du Louvre,” small and large dividers with complete attachments (lead holder, dotting wheel and ink nib), a brass and steel ink pen with lead holder, and a plumb bob and ebony straight rule. A complete example in exceptional condition.
Claude Langlois (1690 -1756) was the preeminent maker of scientific instruments in France during the second quarter of the 18th century. He is first recorded in 1723 working in Paris on the Quai d’Horloge at the sign “Au Niveau.” In the 1730s and 40s he acted as official constructor to the French astronomers, receiving numerous commissions from the Paris Observatory. He also supplied instruments to the Académie Royale des Sciences for mapping expeditions in Peru and Lapland. In 1735 he was named Ingénieur en instruments de mathématiques by the Academy, and, along with the title, received lodgings at the Louvre. Following his death in 1756, he was succeeded by his nephew Jaques Canivet (1720-1774) who continued producing mathematical and surveying instruments of very high quality.
A similar set of drawing instruments can be found in the Smithsonian Museum:
And in various past sale:
Sources: P. Rocca & F. Launay p. 155, Daumas p. 260, F. Marcelin, W.S.D.
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Instrumentum is based in the United States and specializes in high quality 17th and 18th century scientific instruments for mathematics, architecture/engineering, navigation, and the building trades. We have been collecting instruments, mainly from Europe, for over 20 years and have a particular interest in early continental and British architectural drafting sets and dividers. Please contact us at firstname.lastname@example.org.