“As early as the 1830s Charles Babbage had managed to construct a “Difference Engine” which could perform simple sums, but he soon became preoccupied with the far more complicated “Analytical Engine” which could add, subtract, multiply and divide as well as solve both algebraic and numerical equations; it had also been able to print out the results of its calculations onto stereotype plates. This was the engine which Gissing had come to see.”
―
Peter Ackroyd,
The Trial of Elizabeth Cree: A Novel of the Limehouse Murders