Babbage gave his Turin seminar on the Analytical Engine in 1840. The invitation came from the University of Turin, where Babbage explained his ambitious design for a programmable mechanical calculating machine.
The Analytical Engine was more than an improved calculator. Its proposed store would hold numbers, while its mill would perform arithmetic, and punched cards would direct operations. These features made it resemble the architecture of a modern general-purpose computer, even though the machine was never completed.
The Turin lecture was recorded by Luigi Federico Menabrea, an Italian engineer who later published his account in French. That account became the foundation for Ada Lovelace's celebrated English translation and extensive notes. A common mix-up is to associate 1840 with Lovelace's publication itself; her translation and notes appeared three years later, in 1843.