Charles Babbage was a classical example of why there comes a time when you need to shoot the engineers and just build the machine. He could never finish a design and freeze it so it could be built. As soon as he got a better idea as to how to design something he just dropped all work on the current design and started from scratch on the new idea.
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That is because Charles Babbage had conflicts with his chef engineer, Joseph Clement, and ultimately the British Government withdrew it's fund for the project.