Why do circuit breakers go up for on and down for off?

Well, hopefully you are alert and keeping distances and you see the danger with ample time :-D

You can hit the brakes hard, but intermittently - very uncomfortable on passengers.

In cities? In my city I don't remember seeing a single wood house. On some beaches, yes. For political reasons:

It is very difficult to get a building permit in some places, so people plant a prefab instead.

Because high voltage electric fences, except military fences, have a resistor in series, or fed from a limited sized capacitor, so that the voltage drops fast when a body touches them.

how easy or dificult was it to obtain things to work on it? A different voltage on a city would mean a bulb factory dedicated to that city, no?

I remember in the late sixties visiting my mother village (Spain). They had _some_ electricity, and paid by the number of bulbs in the house. It was not metered.

What was the name for the far more gruesome (and fatal) punishment in which an offender was tied over the *mouth* of the loaded cannon which was then fired?

I knew that mains was sometimes DC, but I didn't know that it was sometimes as low as 120 V. I that, AC or DC, it was always around 240 V (actual for DC, or RMS for AC).

Here it did change. We had 220 and they changed silently to 230 without telling us anything. I just noticed that when I measured it I read 230 on a digital multimeter (so there was no error, and I measured in more than one house/city), and when I bought bulbs they also said 230.

They had changed silently the contracts, too. They said we had to renew with some unrelated excuse, and the fine print said 230.

I thought that the redefining of 240 V to 230 V was purely a changing of the tolerance limits so as to include a wider range so both 220 V in mainland Europe and 240 V in the UK were within the tolerance limits, and that nothing physical changed in the generation and distribution chain.

Yep.

Which city so I can street view it ?

So you were wrong.

I thought the same as SteveW: that CB radio in UK and US both used 27 MHz, but US AM CBs were illegal and only UK FM CBs were legal.

I remember reading an ancient book on building your own radio, and they mentioned regenerative receivers with only a single valve. Some would emit back on the receiving antena, so they said don't do this, it is illegal and nasty on your neighbours. Better use two valves, isolating the oscillator from the antena.

The DC would also be RMS, I think. It was not constant as in a battery, but oscillating, from a dynamo.

The plate itself is the flywheel. Good ones were heavy.

...

Right.

Not a question of thinking, but of manufacturing price.

Blown away from the guns. But that wasnt naval, that was the army and was mostly done during the Indian 'mutiny' on a large scale.

Not feasible to do it on a naval vessel given that the cannon is rolled out with the nozzle outside the ship before it is fired on a naval vessel.

The navy went for the other alternative, keel hauling which mostly killed the keel hauled.

Steam locos certainly did have springs. The axles passed through bearings that were guided in hornblocks fixed to the locomotive frames. In some cases the springs were a leaf spring and in others, pairs of coil springs.

They might be visible from the outside:

Not just bulbs. All electrical appliances. While at university, I had a coffee machine and a soldering iron which had 200v elements. Households would obviously had many more items.

When the deer jumps out of the hedge in front of you and stays mesmerised and stationary in the headlights?