Digital Meter

En el artículo , Huge escribió:

ooh, mercury arc rectifiers. I'd love to see one in the flesh, working.

Hopefully from behind a thick sheet of glass. Or from a distance. Or both.

En el artículo , Huge escribió:

The vids on youtube don't show much in the way of protection or warnings (such as "do not look into laser with remaining eye") :)

Mike Tomlinson wrote in news:1yVeIOCPdEcZFwb+@jasper.org.uk:

One at the Midland Railway Trust - Stationary Power Display - linked to a generator. (Derbyshire)

Mike Tomlinson wrote in news:1yVeIOCPdEcZFwb+@jasper.org.uk:

I once operated a machine tool which had one for the varaible speed drives. Fascinating to watch.

Mike Tomlinson wrote in news:1yVeIOCPdEcZFwb+@jasper.org.uk:

Ah Castell Keys for lock-out!

En el artículo , DerbyBorn escribió:

Thank you, added to the list of things to go see.

Mike Tomlinson wrote in news:4$ snipped-for-privacy@jasper.org.uk:

Does this work:

that's not what I criticised

NT

I've worked with them. It's not reassuring to realise you're 2' from large glass bottles of hot evaporating mercury that could break & poison you to d eath at any moment.

NT

Well if that's so, it was not clear from your post. Harry said

"If a neutral is open circuit, it is quite possible for both L and N to seem to be live. The only certain way to check what is what, is with something which draws a more sensible load than a digital meter. A test lamp or similar, might be more suitable."

and your reply was

"Almost none of that's good advice either."

How were we supposed to interpret that?

Not quite in the flesh, but:

I remember seeing the one at the Golder's Green Hippodrome not long after the BBC took it over in the '60s, while the Shepherd's Bush TV Theatre was being modernised. Very impressive looking device.

Think it was only retained to provide 110DC for the Mole camera crane. Don't think much in the way of TV lighting used that, although the back projection systems might have too.

IIRC he said more than that, and almost none of it was good advice. Obviously advice to not use extremely high impedance meter is reasonable, the rest was bad. Do we really need to state the bleeding obvious?

NT

The ones I worked with supplied arc-light projectors. The place was straigh t out of history.

NT

The Museum of Power in the Cardigan Bay area

oops - additional information!

It is The Internal Fire Museum of Power.

A very wortwhile place to visit.

En el artículo , DerbyBorn escribió:

Yes. Thanks again.

There's something rather alien about these things. The bulbous head and the phase 'tentacles'.

I'd love to see one working before they all become a curiosity.

En el artículo , John Rumm escribió:

I've seen that, thanks, and many others on YewTewb. But something in me wants to see a real live working one and to savour the unshielded ultraviolet radiation.

I suppose it comes from being old enough to remember valve TVs - there was that particular smell of hot valves, ozone, warm dust, hot bakelite/paxolin, overheated resistors, voltage droppers that you get from vintage valve radios and TVs.

I'm pretty sure those of a certain age reading this will be nodding in agreement.