Around 1850, Eugène Delacroix painted the central ceiling of the Galerie d'Apollon in which French museum?

Around 1850, George Boole devised a new kind of which branch of mathematics, now used in computer logic? Around 1850, which scientist came up with the idea for an absolute temperature scale? Around 1850, Hermann von Helmholtz measured how fast impulses travel along which body parts? In the mid-1800s, which U.S. industry sent out hundreds of ships, many from New Bedford, Massachusetts? Around 1862, which American locksmith introduced a dial-operated combination lock for bank vaults? In 1862, which doctor invented a hand-cranked, multi-barrel machine gun? Around 1870, Christopher Sholes and partners developed the first practical version of which machine, with a QWERTY keyb… In the early 1870s, which plant breeder developed his famous potato on farmland in Massachusetts?