The year 1843 in science and technology involved some significant events, listed below.
Ada Lovelace, computing pioneer
Plaque on Broom Bridge, Cabra, Dublin commemorating where William Rowan Hamilton inscribed his formula for quaternions
Cyanotype photogram by Anna Atkins
The year 1851 in science and technology involved some significant events, listed below.
Solar eclipse of July 28, 1851: the first correctly exposed photograph of a solar eclipse, using the daguerreotype process.