Minor Strangeness

Ermintruder

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So, where have the magnetic properties of the steel gone when it is hot ? and why do they return ?
What you're referring to is usually known by the scientific term "Curie Point"

In physics and materials science, the Curie temperature (TC), or Curie point, is the temperature above which certain materials lose their permanent magnetic properties, which can (in most cases) be replaced by induced magnetism. The Curie temperature is named after Pierre Curie, who showed that magnetism was lost at a critical temperature.
Practical applications include highly-precise thermostatic electroswitch control systems, metallurgical foundry process pathways and nuclear power industry.

But the summary explanation provided by @Mythopoeika is spot-on.
 

PeteS

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Just on the subject of magnets, I had a funny little happening last week.
I was experimenting with a couple of small 20mm diam rare earth magnets to hold parts of a large model together. They are really powerful even at that size so I totally cleared my small hobby table. Used quick drying epoxy and applied to one magnet and promptly dropped it. Looked round my chair and it was nowhere to be seen. Glued the other one and stuck it to the resin part and left it on the table for a few minutes. Go to make cup of tea and sit back at table. The resin part starts moving randomly around the table totally on its own. I have to say I was a touch spooked (!). Get up and part flies off table. Only then did I notice that the magnet I had dropped had stuck firmly to my jeans and moving my legs under the table was causing the wild antics of the model part. I managed to peel the stuck magnet off and even under my jeans I could make the part dance around with only minute leg movement.
The possibility of fake paranormal effects is endless.
 

EnolaGaia

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... The resin part starts moving randomly around the table totally on its own. I have to say I was a touch spooked (!). Get up and part flies off table. Only then did I notice that the magnet I had dropped had stuck firmly to my jeans and moving my legs under the table was causing the wild antics of the model part. I managed to peel the stuck magnet off and even under my jeans I could make the part dance around with only minute leg movement.
The possibility of fake paranormal effects is endless.
So that's how the technology of illusionists and paranormal fakers advances ... :thought:

:evillaugh:
 

Mythopoeika

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Hmmpf. Nothing supernatural, but odd...
My bedroom light stopped working the other day, so I replaced the bulb and found that it didn't work. Tested the bulbs, found that they both work in another light fitting. So I thought 'OK, light switch needs replacing - it was a bit wobbly anyway' - and I just replaced the lightswitch 5 minutes ago. Only to find... that it still doesn't work.
So - I'm guessing that the cable up in the loft has something wrong with it. I haven't heard any mice or rats up there. It's a mystery.
I guess I'll just get an electrician in.
 

escargot

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Spent yesterday with Escette and my wonderful son in law who is a gas fitter. He was telling us about things that happen at work. Recently he was in a customer's loft and took out a voltmeter to look for a current. (In case the casework on a boiler was live and so dangerous.)

As soon he switched it on it registered a current. Wherever he waved it in the air it did the same thing. It was as if the whole area was full of electricity.
He rang the works electrician who said 'No idea Mate, that's bizarre!'

Son in law is still alive so it wasn't that dangerous. Dunno.
 

Mythopoeika

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Might be worth a try before you fork out for an electrician
Yeah, I might have a go at it tomorrow while it's still light. It might be a loose connection.
The plumber is going up in the loft on Wednesday or Thursday, so I might ask him to give it a visual check.
 

Ermintruder

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So - I'm guessing that the cable up in the loft has something wrong with it.
Cable- no. Very unlikely. Check the ceiling rose in the first room *after* the bedroom, as you walk towards your fuseboard. Just tighten all the connections in that overhead rose, THEN all the ones in the affected bedroom.

Do all this with the breaker or fuse protecting the upstairs turned off, or pulled, and work in daylight off a stepladder (no chair acrobatics).

UK lighting is wired as 'loop-in', in that L/N/E are presented as a series-parallel shared single radial per floor (if small house) or area (if larger).

The only other complication could be two-way switching (eg if you have a 'lazy switch' above your bed AND a wall-switch beside your bedroom door).

Check with the power back on, and if still no light in bedroom, go for an AC multimeter set to eg 400V FSD ~. CAUTIOUSLY insert the black probe into the neutral common block (easily identified by having a single black or blue 1.5mm cable, and one of the two drop-flex leads feeding the bulb-holder) in the rose, and put the red probe to the other drop-flex cable.

Try the light-switches in multiple combos, and if you DO get power, @Shady is quite correct, it's the fitting at fault.

If I lived closer, I could diagnose it in under 2mins
 
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Ermintruder

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I really should buy one at some point,
They are as cheap as calculators, and should be owned by anyone you'd trust with any other potentially-lethal tool or instrument (scalpels, wallpapering scissors, pressure-cookers, shotguns, axes, garden wood-chippers and ouija boards)
 

Mythopoeika

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They are as cheap as calculators, and should be owned by anyone you'd trust with any other potentially-lethal tool or instrument (scalpels, wallpapering scissors, pressure-cookers, shotguns, axes, garden wood-chippers and ouija boards)
They're all cheap, but none of the brand names are familiar to me. Which one do I trust?
 

Ermintruder

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I hear good reports about all Screwfix Direct budget-priced tools & testgear....consider this one for under £10 LAP digital multimeter

(ps back when the world was simple, and I was still a baby, my life frequently revolved around an Avo8....these are now the electronic engineering equivalent of buying a Series III Land Rover. I then graduated onto a Fluke77, which I still have to this day....that equates to buying an old Porsche against good advice. I never use it (officially) but it gets used at least a couple of times a week)
 
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PeteS

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Spent yesterday with Escette and my wonderful son in law who is a gas fitter. He was telling us about things that happen at work. Recently he was in a customer's loft and took out a voltmeter to look for a current. (In case the casework on a boiler was live and so dangerous.)

As soon he switched it on it registered a current. Wherever he waved it in the air it did the same thing. It was as if the whole area was full of electricity.
He rang the works electrician who said 'No idea Mate, that's bizarre!'

Son in law is still alive so it wasn't that dangerous. Dunno.
I would suspect a faulty voltmeter rather than a loft full of electrickery.
 

IamSundog

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Spent yesterday with Escette and my wonderful son in law who is a gas fitter. He was telling us about things that happen at work. Recently he was in a customer's loft and took out a voltmeter to look for a current. (In case the casework on a boiler was live and so dangerous.)

As soon he switched it on it registered a current. Wherever he waved it in the air it did the same thing. It was as if the whole area was full of electricity.
He rang the works electrician who said 'No idea Mate, that's bizarre!'

Son in law is still alive so it wasn't that dangerous. Dunno.
Very strange tale.
 

INT21

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Ermintruder,

I have a couple of Fluke 23 VOMs, and a Selectest Super 50. This is very similar to an AVO 8.

I like the large analogue scale, and feed it with a variety of home made OP-Amp buffers to jack up the input impedance.

I do have an AVO Digital Meter (AVOmeter DA 116) but it has a fault on one of the ranges. Plus all kinds of other odds and sods meters.

But the three listed at the top do most jobs.

INT21.
 

James_H

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Minor but it freaked me out: last night I took a shower, using a bar of soap. This morning I took another, and the bar of soap had disappeared. I live alone, and there is literally no reason I would have absent-mindedly moved the soap from its habitual place. A search of the house turned up nothing.
I think I've solved it. Recently my bar soap has developed teethmarks. Rats or mice are eating it (bad news that I have rats or mice). Perhaps they dragged away the previous bar into their mousehole.
 

Lb8535

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Yes they do eat soap but you should be seeing mouse poop in the same area. I can't envision a mouse dragging away a bar of soap, although they do create caches of seeds in unlikely places. Borrow a cat for a day just to get the scent into the area.
 

skinny

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Space Oddity!!

@EnolaGaia, you may be able to explain this one. Just happened. 30 minutes after sundown I'm skygazing westward and I see my first satellite of the evening. Just a really dim steady mover like you'd expect under a near full moon. Then within seconds it glows brighter and brighter and suddenly I see there are now two points of bright light in tandem right next to one another and the shine gets brighter and brighter for about ten seconds then slowly dims over another 20 seconds and disappears like you'd see one go behind the shadow of the earth.

I was speculating it must be a conjunction of two separate birds and that they would drift apart in time and vector, but they stayed exactly parallel and glowed and dimmed together, as if they were joined together as part of one structure.

There is no ISS here in Adelaide tonight. I'd just checked before I went outside. I thought when it started to get really bright that it was the ISS and there'd been an error by NASA until that second light appeared right next to the first like they were two ends of a barbel structure. No ISS. This was a very different satellite. I know my space cans. This thing I'd never seen before.

I also considered it must be an iridium and it would rotate around and get back into glow again as they are wont to do spinning about. It never reappeared. I followed the trajectory it would have taken for five minutes and nada.

Weird. WTF?
 

Mythopoeika

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Space Oddity!!

@EnolaGaia, you may be able to explain this one. Just happened. 30 minutes after sundown I'm skygazing westward and I see my first satellite of the evening. Just a really dim steady mover like you'd expect under a near full moon. Then within seconds it glows brighter and brighter and suddenly I see there are now two points of bright light in tandem right next to one another and the shine gets brighter and brighter for about ten seconds then slowly dims over another 20 seconds and disappears like you'd see one go behind the shadow of the earth.

I was speculating it must be a conjunction of two separate birds and that they would drift apart in time and vector, but they stayed exactly parallel and glowed and dimmed together, as if they were joined together as part of one structure.

There is no ISS here in Adelaide tonight. I'd just checked before I went outside. I thought when it started to get really bright that it was the ISS and there'd been an error by NASA until that second light appeared right next to the first like they were two ends of a barbel structure. No ISS. This was a very different satellite. I know my space cans. This thing I'd never seen before.

I also considered it must be an iridium and it would rotate around and get back into glow again as they are wont to do spinning about. It never reappeared. I followed the trajectory it would have taken for five minutes and nada.

Weird. WTF?
A reflection off ice crystals in the upper atmosphere?
 

EnolaGaia

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Space Oddity!! ... Weird. WTF?
I've seen a second satellite flare into view and appear to be following (and even closing the distance to ... ) the ISS soon after sunset. The first time it happened I was with a friend who's into stargazing / amateur astronomy. We ID'd the ISS first. The second satellite flared brightly, moving in the same direction as the ISS and seemingly on the same track as if following it. The second object was closing on the ISS just as the ISS "disappeared" (crossed the terminator into the earth's shadow).

My friend quipped, "Did we just see a killer satellite destroy the ISS ?!?"

FWIW ... We checked the relevant databases online, and we determined there was no resupply mission heading to or from the ISS around that time.

My first guess is that you saw two orbiting objects in similar orbits at different altitudes, and the apparent flaring resulted from reflecting more of the sunlight from beyond your horizon at that early evening hour.
 

escargot

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A few weeks ago - I reckon it'll be 4 weeks tomorrow - Techy and I were at the petrol station till together waiting to pay for fuel or wine or whatever, when we both suddenly stumbled and nearly fell over. We were standing still, totally sober. It was as if the floor had tilted.

We went 'WTF?' and then it was our turn so we carried on and forgot about it for a few days. Maybe it was a little earthquake?
 

skinny

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My first guess is that you saw two orbiting objects in similar orbits at different altitudes, and the apparent flaring resulted from reflecting more of the sunlight from beyond your horizon at that early evening hour.
Seems plausable. Only thing is,
I was speculating it must be a conjunction of two separate birds and that they would drift apart in time and vector, but they stayed exactly parallel and glowed and dimmed together, as if they were joined together as part of one structure.
So different altitudes would likely mean a separate dimming time. I'm not doubting it was terrestrial. It was as bright as the ISS at peak glow. It had all the appearance of a docking of two massive stations. Is China hiding a low orbit colonisation enterprise? I'm serious.
 
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