Work with Babbage
Ada met Babbage in 1833 when she was just 17, and they began a voluminous correspondence on the topics of mathematics, logic, and ultimately all subjects. Babbage had made plans in 1834 for a new kind of calculating machine (although the Difference Engine was not finished), an Analytical Engine. His Parliamentary sponsors refused to support a second machine with the first unfinished, but Babbage found sympathy for his new project abroad. In 1842, an Italian mathematician, Louis Menebrea, published a memoir in French on the subject of the Analytical Engine. Babbage enlisted Ada as a translator for the memoir, and during a nine-month period in 1842-43, she worked feverishly on the article and a set of Notes she appended to it. These are the sources of her enduring fame.
Ada called herself "an Analyst (& Metaphysician)," and the combination was put to use in the Notes. She understood the plans for the device as well as Babbage but was better at articulating its promise. She rightly saw it as what we would call a general-purpose computer. It was suited for "developing and tabulating any function whatever. . . the engine is the material expression of any indefinite function of any degree of generality and complexity." Her Notes anticipate future developments, including computer-generated music. -San Diego Supercomputer Center