"Never look into the laser with your one remaining good eye"
Good old days
- Thread starter ericmark
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WARNING
CO2 lasers in use.
CO2 laser beams are invisible.
Do not put any part of your body into the path of an invisible laser beam.
If you do, the pain and the smell of burning flesh will alert you.
CO2 lasers in use.
CO2 laser beams are invisible.
Do not put any part of your body into the path of an invisible laser beam.
If you do, the pain and the smell of burning flesh will alert you.
ericmarK said:
The science museum in London has a one million volt generator built from two stacks of capacitor plates criss-crossed with selenium rectifiers. It's a voltage multiplier, originally driven by some unseen high voltage AC supply under the floor. You can walk right up to this thing and almost underneath it. So there I am, looking up at a megavolt capacitor stack - and no shorting link!
Another H&S violation story - but not a trick played on the innocent.
My dad was a printer all of his life, and at one time they used to use soldering irons to joint etched zinc printing plates. I've tried to find an image on Google, but failed.
Imagine something 30-40cm long, with a wooden handle, and a metal shaft with an end like a small, thick, blunt axe head or tomahawk. That would be placed on a gas burner until it was hot enough to be used to butt join considerable lengths of plate together before needing to be reheated.
The mad ones used to hold a hot iron by the handle, and toss it up into the air, and as it came down, spinning, would catch it.
Hopefully by the handle.
something like this?
I recall during my apprenticeship, using this to solder up tundishes, tin drip trays and the like.
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My grandfather's soldering iron, c1910. I still use it occasionally (for non electrical joints!) - goodness knows what he used it for!
Kind Regards, John
A
Alarm
A
Alarm
ericmarK said:
The science museum in London has a one million volt generator built from two stacks of capacitor plates criss-crossed with selenium rectifiers. It's a voltage multiplier, originally driven by some unseen high voltage AC supply under the floor. You can walk right up to this thing and almost underneath it. So there I am, looking up at a megavolt capacitor stack - and no shorting link!
Caught that bloody "floating " brass ball yet.
And I bet its not brass
Training to do live work when I was an apprentice involved a special set up that rang a big alarm bell rather than getting a belt if you got it wrong. The favourite trick of the day was to rattle the bell with socket or similar just as the more nervous apprentices were working!!!!!
Well, it wasn't really a question - but you're right, there's no telling what it might start around here!goodness knows what he used it for!You should not ask questions like that on here
I've got a whole pile of his tools, all of which he told be he'd had since his 20s (around 1905-1915), and most of them are still usable - they certainly "don't make them like wot they used to!". In particular, his tenon saw is still in routine use and going strong - and has outlived countless (both cheap and expensive) late 20th century and 21st century 'copies'!!
Kind Regards, John.
Another H&S violation story - but not a trick played on the innocent.
My dad was a printer all of his life, and at one time they used to use soldering irons to joint etched zinc printing plates. I've tried to find an image on Google, but failed.
Imagine something 30-40cm long, with a wooden handle, and a metal shaft with an end like a small, thick, blunt axe head or tomahawk. That would be placed on a gas burner until it was hot enough to be used to butt join considerable lengths of plate together before needing to be reheated.
The mad ones used to hold a hot iron by the handle, and toss it up into the air, and as it came down, spinning, would catch it.
Hopefully by the handle.
something like this?
I recall during my apprenticeship, using this to solder up tundishes, tin drip trays and the like.
Used to use these type of irons when soldering the risers on commutators.
Had a very large armature, (5' diameter), from Trawsffynedd(?) power station during the late 70's early 80's which had been rewound in work. After coming out my apprenticeship I was put on this job with a couple of skilled blokes as an 'Improver' and was taught how to use these. One particular one was a solid block of copper about the size of a house brick, (9" x 3") with the front end cut away by about 3" off the length and tapered from 1/8" to about 1" at the face of the block. This was heated up on a gas ring and then I had to insert it between the risers and hold it steady while the skilled blokes ran the solder in to the joints. The smoke off the flux was a killer!! Always had 2 irons on the go, one on each side of the job and I had to hold one and then when finished rush round to the other side and do the same for that bloke. It was knackering!
we were taught with those soldering irons in the late 60s at school in the metalwork class joining plates together etc.
If you were given a couple of rivets to join something instead and you lost one on the floor you would spend the rest of the lesson searching for it as you would not be allowed a replacement
If you were given a couple of rivets to join something instead and you lost one on the floor you would spend the rest of the lesson searching for it as you would not be allowed a replacement
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Last time I used one was on Falklands replacing the field coils on a generator clearly until repaired no electricity so only option. Luck I knew about green flame.
My granddad used those sorts of irons to sear off lambs tails.
He'd use rubber rings to castrate them though.
...No, I've got no desire to be a farmer, why do you ask?
He'd use rubber rings to castrate them though.
...No, I've got no desire to be a farmer, why do you ask?
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These days they use rubber rings for both.
And, incidentally, for circumcision too.
And, incidentally, for circumcision too.
They circumcise lambs?
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