Babbage’s difference engine #2 has been built and has “just gone on display in Silicon Valley” (Where? Not sure. Make sure you make a left turn at Albuquerque. Then ask.)

Despite Babbage’s reputation and government backing, the machine was never manufactured.

The plans were consigned to the dustbin of history until they were fished out by Mr Swade when he was working at the Science Museum in London. While there he went on to create the world’s first Difference Engine No 2. which was completed in 1991.

And, of course, one is reminded of Babbage’s excellent quote about GIGO:

On two occasions I have been asked [by members of Parliament!], “Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?” I am not able rightly to apprehend the kind of confusion of ideas that could provoke such a question.

Hat tip to Caroline.