Three instruments titled 'Physique - Thermobatometre ou appareil pour mesurer la temperature de la mer a de grandes profundeurs', ('Apparatus for measuring ocean temperatures at great depths').
The engraving is based on one of several drawings made by Nicolas-Martin Petit (1777–1804), and Charles-Alexandre Lesueur, both artist on Nicolas Baudin’s expedition. Having participated in two scientific expeditions during the 1790s, Baudin was commissioned by the French government in 1800 to survey the Australian coast. The voyage, endorsed by Napoleon, was also tasked with studying natural history and making detailed scientific observations of Indigenous people. Consequently, Baudin’s vessels, Le Géographe and Le Naturaliste, were lavishly equipped, with twenty-two scientists among the expedition’s company. Petit and another artist, Charles-Alexandre Lesueur, embarked as gunner’s mates, but were elevated to official artist roles when the men initially appointed to those posts quit six months into the expedition. Lesueur focussed on the recording of landscape and species, while the depiction of the people fell largely to Petit, a Paris-born draughtsman who’d had some training in the studio of Jacques-Louis David. After surveying the western and southern coats of the continent throughout the latter half of 1801, in early 1802 Baudin’s ships called at the D’Entrecasteaux Channel, Bruny Island and Maria Island in Tasmania, where Petit made several portraits which have subsequently come to be considered important records of Indigenous life in the period prior to permanent European colonisation. From June to November 1802, the expedition was delayed in Sydney while the two vessels were repaired, providing the opportunity for Petit to complete portraits of people of the Cadigal, Dharawal, Gweagal, Kurringai and Darug language groups of the Sydney region.
An interesting documentary about Baudin’s expedition can be found on youtube in the following link
