Charles Babbage designed his Difference Engine No. 2 between 1847 and 1849, aiming to automate the calculation of mathematical tables with high precision. Unlike many of his contemporaries, Babbage's failure to complete the machine was not due to technical issues but a lack of funding. Born in 1791 and passing away in 1871, Babbage was an inventor, philosopher, and polymath who worked on a wide range of projects, from lighthouse signaling systems to early forms of encryption. He is most famous for his calculating machines, which are now seen as foundational to the history of computing. The Difference Engine No. 2 was designed to process numbers with up to 31 digits using a method known as seventh-order differences. The machine was composed of 8,000 parts made of bronze, cast iron, and steel. In 1991, the Science Museum in London rebuilt the machine based on Babbage's original designs, proving that the concept was both feasible and functional. The original blueprints had been stored for decades and were considered more as historical artifacts than practical blueprints, until curator Doron Swade initiated a serious effort to reconstruct the machine. In 1985, the Science Museum began a project to build a Difference Engine No. 2 that closely followed Babbage's designs from 1847–1849. The goal was to mark the bicentenary of Babbage's birth in 1991 and to answer two key questions: Could Babbage have built his machine, and would it have worked? Reconstructing the machine from sketches over 150 years old was not a simple task. Babbage had left detailed technical drawings, but they were not enough to serve as direct manufacturing instructions. Gaps in the designs had to be filled, and sometimes decisions had to be made based on conflicting notes. The completed machine, which weighs about five tons and measures 3.4 meters in length and two meters in height, was displayed in 1991. The printing module, however, took an additional 11 years to complete and was added in 2002. The machine uses the method of finite differences, which allows complex mathematical calculations to be performed using only addition, avoiding multiplication or division. Operated by a crank, it can produce and print numerical tables with remarkable accuracy. The machine also includes a safety mechanism that locks it if an error is detected, a design feature that would impress many modern software systems. A second copy of the Difference Engine No. 2 was built a few years later, funded by an American patron, and completed in 2008 for the private collection of Nathan Myhrvold. This replica was displayed at the Computer History Museum in Mountain View, California, where it operated publicly for seven years, proving that Babbage's design was not a one-time success. Despite his brilliance, Babbage struggled with the practical aspects of securing funding and political support. The Science Museum's reconstruction in the early 2000s finally gave recognition to a man who had spent his life believing his work would never be realized.