The first mechanical computer was the Difference Engine built in 1822 by Charles Babbage, considered as the "father of the computer." Between 1847 and 1849, he made an improved version of his first model, which he called Difference Engine No. 2. However, the machine was not transformed into a full-scale functional device due to lack of funding.
The Difference Engine did not resemble the modern computers of today. It was massive and consisted of up to 25,000 components. The machine weighed 15 tons and was 8 feet tall.
In 1991, the London Science Museum completed the Difference Engine No. 2 to commemorate the bicentennial of Babbage's birth year.