Vetinari's Clock (2011)

In Cambridge we've got a clock called the Chronophage which is intended to be a sinister "eater of time" - the designer has done a good job of making it feel uncomfortable to look at. There's some detail here: https://www.corpus.cam.ac.uk/articles/secrets-corpus-clock

My memories of what I've heard over time:

* The grasshopper escapement actually is the demonic insect that sits on the top, "walking" around the serrated ring.

* Although it's backlit electronically it's actually a fully mechanical design - including all of the weird things it does.

* The Chronophage itself blinks its eyes unnervingly.

* It sometimes pauses or ticks slightly backwards, then runs faster to catch up again.

* On certain special dates it does extra weird stuff.

* The "chime" is a metal chain dropping into a box.

There were three made in the series, this was the first one. I've always found it slightly unappealing aesthetically but also compelling - there's no arguing with the fact that there's always a crowd of fascinated observers looking at it.

> a clock called the Chronophage

Until recently there was one in the wall of a bar in Douglas here on the Isle of Man. Apparently, the inventor of the thing lives here. Another is in his home.

However that bar, the rather rough 1886, is now the Island's first Wetherspoons... :-/

I saw the one in Houston and it's quite fascinating. Not particularly unsettling unless you find bugs unappealing. Enjoyed the engineering for the device. Very cool and it looks cool too.

At first sight, it looks like some modern art piece but then you see the plaque that it's not an electronic clock (it has LEDs which made me think it was) and then it's cool!

George Daniels, Roger Smith and this clockmaker John Taylor. Must be something in the tides?

How do you build a completely analog "random" system? Building a regular one is easy, building one that might seem random because of how many regular ones are tied together ... but true sources of entropy?

I would imagine that analogue randomness is easier than doing it in a deterministic digital system. Surely there are all sorts of creative methods. Dice or coins in a box? A ball falling through a galton board? Sampling a double-pendulum? Floating particles in a heated liquid?

Heat and fluids are great sources of randomness, so you use a lava lamp.

All of those things I know how to use - if I have some sort of digital measuring device watching/monitoring them.

How do I make a mechanical thing happen at a random time with a lava lamp?

The ball on the board with a hole might be something I could figure out …

> How do I make a mechanical thing happen at a random time with a lava lamp?

Use a heat lamp interrupted by the lava globules to activate a wax motor. If you get the angles right you can probably do this with the same light that runs the lamp itself, or you can put another lamp at a 90° angle (but will have to adjust the main lamp to keep the total heat at the level you want).

Or do similar with muscle wire; more temperature needed to trigger the actuator, but you can get them much smaller so the total heat can be smaller, if you run e.g. a collimated infrared laser as your heater across the lamp.

> Must be something in the tides?

Or the tax régime, I suspect, TBH...

Wikipedia article with video:

https://en.wikipedia.org/wiki/Corpus_Clock

Yeah, Daniels was selling watches for low 7 figures so VAT or other forms of purchase tax would have been a significant chunk of change. And income tax of course.

"Daniels claimed that there was little money to be made in watchmaking, but his lifestyle suggested otherwise. In 1982 he moved, for tax reasons, to the Isle of Man, where he bought a substantial Georgian house complete with tradesmen’s entrance and sweeping drive."

https://www.telegraph.co.uk/news/obituaries/8846796/George-D...