What was the name of the machine for which Ada Lovelace wrote the first algorithm?

The machine for which Ada Lovelace wrote the first algorithm was Charles Babbage’s Analytical Engine. Her celebrated notes described a method for calculating Bernoulli numbers on this proposed mechanical computer.

The Analytical Engine was designed in the 1830s as a general-purpose, programmable machine. It was never completed, but its planned architecture included a “mill” for processing, a “store” for memory, punched cards for instructions, and conditional operations—ideas that resemble parts of modern computers.

Lovelace translated an Italian article about the machine and added extensive notes of her own in 1843. Her Note G contained the Bernoulli-number algorithm and is widely regarded as the first published computer program. A common mix-up is the Difference Engine, another Babbage project designed primarily for automatic calculation of mathematical tables. The Analytical Engine was the more ambitious machine and the one connected with Lovelace’s algorithm.