The designers of this exhibit had cleverly filled in that awkward gap with some material about early mechanical computers, including a working replica of Babbage’s difference engine (built in a fit of nerd energy, and later contributed to this museum, by a different local tech magnate). There was the obligatory shrine to Ada Lovelace and then a fast-forward to the mid-twentieth century and a black-and-white photo of the young Alan Turing, Lawrence Pritchard Waterhouse, and Rudolf von Hacklheber on a bicycling expedition. This was where C-plus began to feel he was losing the thread, since the last mention of any Hacklhebers he’d seen was from 250 years earlier—but apparently this Rudolf was one of those hyperprivileged white guys who actually turned out to have legit mathematical talent. Anyway it kicked off a whole wing of the exhibit featuring an offbeat mix of stuff C-plus had seen in twenty other museums (Enigma machine, photograph of Turing bombe) with unique exhibits such as a computer that Lawrence Pritchard Waterhouse had apparently made out of organ pipes and mercury-filled U-tubes.

There was a big map of the world festooned with swooping trails of LEDs and flat-panel monitors, trying to convey some elaborate chain of events in which the contents of the Leibniz-Archiv had been removed from Hanover, either to keep these priceless relics safe from Allied bombing raids or because Göring wanted to melt it all down, and somehow made their way, via U-boat, to the Philippines—only to be sunk, and later recovered by Waterhouses and Shaftoes.

The point being that the hoard consisted of gold plates with holes punched in them, like an early version of IBM punch cards, and they were meant to be used in a mechanical computer called the Logic Mill. The Logic Mill had been much talked about, by various savants, since the era of Oliver Cromwell, but had never really been constructed and made to work properly until Randy Waterhouse—one of the founders of the Weird Cyber Bank—had plowed some of his windfall into actually building a working replica. This had taken more than a decade because, to make a long story short, the eighteenth-century design made very little sense on a mechanical engineering level and required a lot of humans to move things around. And yet they had made it work using the actual, original plates from the Leibniz-Archiv.