Deaths from cholera

Jean-Félix Adolphe Gambart (12 May 1800 – 23 July 1836) was a French astronomer.He was born in Sète in Hérault department, the son of a sea captain. His intelligence was noticed at a young age by Alexis Bouvard, who persuaded him to join the astronomy profession. In 1819 he joined the Marseilles Observatory and became the director in 1822.
During his career he recorded a number of observations of the satellites of Jupiter, and discovered a total of 13 comets. In 1832 he observed the transit of Mercury across the Sun, noting that the planet appeared deformed as it approached the edge.
He suffered from tuberculosis, and in 1836 died from cholera in Paris, aged 36.
The crater Gambart on the moon is named after him. He was also awarded the medal of the London Astronomy Society for his calculation of a cometary orbit.

Henriette Sontag, born Gertrude Walpurgis Sontag, and, after her marriage, entitled Henriette, Countess Rossi (3 January 1806 – 17 June 1854), was a German operatic soprano of great international renown. She possessed a sweet-toned, lyrical voice and was a brilliant exponent of florid singing.

Nicolas Léonard Sadi Carnot (French pronunciation: [nikɔla leɔnaʁ sadi kaʁno]; 1 June 1796 – 24 August 1832) was a French mechanical engineer in the French Army, military scientist and physicist, often described as the "father of thermodynamics". He published only one book, the Reflections on the Motive Power of Fire (Paris, 1824), in which he expressed the first successful theory of the maximum efficiency of heat engines and laid the foundations of the new discipline: thermodynamics. Carnot's work attracted little attention during his lifetime, but it was later used by Rudolf Clausius and Lord Kelvin to formalize the second law of thermodynamics and define the concept of entropy. Driven by purely technical concerns, such as improving the performance of the steam engine, Sadi Carnot's theoretical work laid important foundations for modern science as well as technologies such as the automobile and jet engine.
His father Lazare Carnot was an eminent mathematician, military engineer, and leader of the French Revolutionary Army.

Inessa Fyodorovna Armand (born Elisabeth-Inès Stéphane d'Herbenville; 8 May 1874 – 24 September 1920) was a French-Russian communist politician, member of the Bolsheviks and a feminist who spent most of her life in Russia. Armand, being an important figure in the pre-Revolution Russian communist movement and the early days of the communist era, had been almost forgotten for some time (due to deliberate Stalinist censorship, partly in consideration of her relationship with Lenin) until the partial opening of Soviet archives during the 1990s (despite this, many valuable sources regarding her life still remain inaccessible in Russian archives). Historian Michael Pearson wrote about her: "She was to help him (Lenin) recover his position and hone his Bolsheviks into a force that would acquire more power than the tsar, and would herself by 1919 become the most powerful woman in Moscow."