Brew
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Posts posted by Brew
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The MINIMUM distances for safe working clearance:
low-voltage line – 1 m;
– 11 kV and 33 kV lines – 3 m;
– 132 kV line – 6 m;
– 275 kV and 400 kV lines – 7 m;
These figures are for clean, open air, down a mine with a dusty atmosphere lord alone knows how far it could 'jump'.
If you like scary see the YouTube videos of linesmen approaching the big towers by helicopter..... and then climbing down onto live lines at thousands of volts.
For images of ionisation : https://en.wikipedia.org/wiki/Tesla_coil, some of them are impressive and generate a million volts. Are they safe? NO, is the short answer - unless you really know what you're doing.
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There were two Compo, Venus and Alida
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Mary, blind, partially sighted and deaf people know when to cross on 'silent' crossings by feeling under the button box. There is a small projection that spins when it's safe to go. Try the one on Heanor market to see what I mean.
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We had a Van der Graff at school that had a handle you turned to rather than an electric motor, though it looked nothing Compos and had a metal sphere rather than a glass barrel.
The John Wesley version was not called a VdG but the principle is exactly the same with the exception the 'belt' was static and the glass barrel revolved.
I worked on the polythene machines at a Heanor factory many years ago installing earthing cables to try and prevent static build up. The energy generated could be significant and although the current was quite low anything above 30mA could, in certain circumstances, be very dangerous.
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You're quite right Compo on both accounts. It is a Van der Graf and it was used for ECT. The design appears to have changed little since John Wesley (yes the Methodist) invented it in 1747. Scroll down to about half way to see what I mean here:
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I've not heard of this being done but reading the 'fake' message lizzie had made me wonder why they bother. The only thing I can think of is house breaking. There is software that can spew these out by the hundreds in a matter of minutes and with some phone plans offering unlimited free texts there is no cost to them. The percentage of people who reply will be miniscule but that could still mean a considerable number of 'hits'.
When you do reply they will know the number is 'live'. Using freely available tracker programs they simply chose a location and will know where you live and when you are away from home. Just a thought and probably wide of the mark...
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They have discovered that the more reaction it engenders the more memorable it is - and that's really the whole point.
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Crikey, I thought it was a pic of the late Princess Margeret...
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I can remember it well. We went on a caravan holiday on the bank holiday and shortly after the heatwave broke. Oh boy did it break. When we arrived several camping sites were flooded by torrential rain, broken down cars (especially minis) littered the main road into Yarmouth and for the next seven days we were like drowned rats - after sweltering all summer we were decidedly unimpressed.
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Wow! We were still sending convicts to Van Diemans Land in 1932! Well blow me down sport I didn't know that.
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I can admire it from an aesthetic point of view but what possible reason could anyone have for owning something like that?
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I've seen that photo before on the internet entitled: 1850 Veteran of Waterloo and his wife.
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Looks to me as though some has already eaten it once.
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You're quite right Bing it was Bradstock and the metalwork teacher I couldn't place was Mander.
I remember Mr Wallace and his habit of adjusting his gown, usually accompanied by nodding his head and poking his tongue out.
The only memory I have of Burns is breaking up a fight up a fight in the playground and mentioning him a poem like wot I wrote. Won the poetry prize 'n' all it did.
I think the R E teacher was Dawkins? Never paid attention, didn't believe a word and did next to nothing in the way of work - somehow I was given top marks and I still have the New Testament with my name gold blocked on the spine that they gave me.
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Really? I must pay more attention.... Ta
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Nuts? hmm, that reminds me, anyone remember monkey nuts?
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As a callow youth (student) I had jobs at Macfisheries, Burtons food shop and Burtons tailors - not all at the same time. Macs was next to the bank on the market square. Burtons was under the council house and Burtons (some called it the 'fifty bob tailors') was on the corner of Clumber St facing what is now viccy centre.
Sacked from macs for wrapping a frozen salmon round the head of a bullying supervisor. Left Burtons foods of my own accord. Was 'advised' that maybe retail mens wear was not my forte after a whole week without selling a single item.
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Never seen a 360 on a swing, not even sure I believe it can be done... but I could be wrong
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- How on earth do you steer it? It looks as though the pedals move with the wheel in which case how do you pedal it in anything other than a straight line?
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#49
Bovril............... with milk!!!
It's the end of civilisation as we know it for sure.
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In all probability they are 'crawler bots' not human.
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I liked riding upstairs on a bus (I actually proposed on top of a bus) but as a child I'd look to see if the window behind the drive was 'my special one'. These windows had quite a curve to the right and if I stood I could watch the driver drive the bus. Fascinating - I thought bus drivers must be very clever because they could remember exactly how many times to turn the steering wheel to make the bus go round the corner.
I loved trolley buses too.
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So they are... damn, the senior moments are getting closer together.
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Wot no Spangels!
or was it Spangles
Item ID required, please.
in Owt' Abaaht Nowt !
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Col, It's true all cables will 'charge' up even when they are de-energised, they don't have to be 'miles' long. Conductors are discharged using a big resistor (sometimes called a 'dump stick') to remove any capacitive charge and then earthed.
So serious is the risk that 'Permit to work' rules apply with very specific conditions documented and signed by all parties working on the system.