cycles to hertz - when?

[Tim Streater]

Watching an episode of Foyle's War larse night. There was a wartime (presumably prewar model) car that had two rear lights. I thought that was only a postwar requirement.

[Bob Eager]

Ah, I see. I was a founder member of the College. I ended up being its Master for 10 years. That's a sort of executive position covering student welfare (e.g. emergency counselling, fixiung problems), discipline (fining students or chucking them out of their accommodation!) and entertaining important guests. The Darwin family used to come to our dinners, and I got to know them quite well. I still see one of them fairly often.

[Max Demian]

Doesn't mean they didn't make ones with two at the back.

[2987fr]

When lazy colonists showed up originally, and back to the original when they went home.

And when did airfield become airport.

[Roger Hayter]

I remember them! I came across them regarding X-rays, I don't know if they are still used in that field.

[Custos Custodum]

X-rays and gamma rays are usually described in terms of their photon energy (in electron volts). It yields more sensible numbers and in most cases is the only property that can be readily measured.

[Bill Wright]

They are don't knows.

Bill

[Bill Wright]

I'm genuinely impressed.

Bill

[The Natural Philosopher]

Odd.

I would have thought they would be using valves and electricity?

[The Natural Philosopher]

Might have been, but plenty of cars had them in the 30s

[The Natural Philosopher]

When international commercial traffic started using them

In fact in between was 'aerodrome'.

[charles]

when the used concrete instead of grass for the runways

[2987fr]

That?s not really true in europe with airships.

True.

[2987fr]

Fraid not and plenty of them still don?t use concrete.

[harry]

We always called them "Aerodromes" in the UK.

[harry]

Most use tarmac. Only wartime runways used concrete. (No joints)

[Tim Streater]

OK - so not an anachronism then. I must have been given the wrong impression by someone as a skoolboy.

[Roger Hayter]

I agree there is a lot to be said for using a property you can actually measure, especially if referring to properties like dispersion, but doesn't a photon energy imply a specific wavelength theoretically?

[swldxer1958]

In our lab at BP we quoted small wavelengths in nanometres.

[Bob Eager]

Hard work. On call 24/7 weekdays, 1 in 4 weekends. Dead students at 3 a.m. Firts one was 3 weeks after I started.

I didn't realise how stressful it was until I stopped.