Edouard BOUTY, Paris Cercle hydrographique, known as "de Borda", in partially blackened brass and silver-plated graduated ribbon, with turned wooden handle. Signed and numbered 1. Diameter: 26.5 cm. Wear, scratches, a few stains and oxidation. In a walnut case, with brass side handle, with accessories and brass plate on front, engraved "Service hydrographique, Cercle Hydrographique n° 503, Édouard BOUTY n° 503" (wear, numerous scratches and dents, and a few cracks and chips; some accessories missing).