Equipotential at Sty Head Tarn

 Retreating high water had left a mark linking places of the same height - a natural equipotential.

What is causing the "waterfall" of cloud?

It was a cloudy start after the stormy weekend but by lunchtime the sky had cleared over Birks. However there was cloud tumbling over the top of Hart Crag and down into Deepdale like a waterfall. How does that work? For there to be cloud, the humidity needs to be at or higher than the saturation level for air of that temperature. Today I suspect that the cloud on the west side of the hills reflects moist air coming in from the sea which would increase the humidity. Where I was standing the sun has increased the temperature so that the air is no longer saturated. My hypothesis is that the cloud is tumbling over the shaded side of the hill where the sun is not reaching so the air there will be colder and become saturated more easily. I'll need to remember to look next time to see if it happens over sunny slopes.
 

The range of a micrometer screw gauge

I've taught about the resolution of a micrometer screw gauge before (+-0.01mm) but I've not considered the maximum reading. This would be called the Full Scale Deflection (FSD) on an analogue electrical meter - the largest reading on the scale. Turns out that for the micrometer it is 25mm.
 

What is inside a digital thermometer?

 A broken thermometer gave me the chance to look at the temperature sensor.

Using a magnifying glass, I could see what looks like a glass bead with two clear contacts inside. It doesn't look like a thermistor. So it could be an RTD - resistance temperature detector. I hadn't realised there was so much to think about. I learned a few years ago about the relative merits of 2-wire and 4-wire probes but this article even includes 3-wire probes.

After the first 100 moves

 This is where I've got to after 100 moves. It does reflect the probabilities quite well.

Quantum shuffling update

 It's coming on but to get a full view I'm going to need about four times as many moves. I think that I have calculated the number of microstates for J incorrectly. Update soon.

Quantum shuffling day 3

 Today there was a lot of shuffling between different microstates in E