Things you always wanted to know the answer to [Vol. 3]
Discussion
Alignment of electrons in bricks
I was talking to an archaeologist (not a detectorist...
) last week who was using a magnasomethingorother ('radar') to survey one of my sites. I asked what it could detect and she went through the various usual things but then mentioned bricks.
Bricks apparently show up very well because, 'of course', all of the electrons align to the north pole when the bricks are fired. I chuckled, agreeing 'of course'.
So can anybody enlighten me as to why this happens or alternatively confirm as I suspect that this is utter horse s
t/the archaeological equivalent of tartan paint?
I was talking to an archaeologist (not a detectorist...
) last week who was using a magnasomethingorother ('radar') to survey one of my sites. I asked what it could detect and she went through the various usual things but then mentioned bricks.Bricks apparently show up very well because, 'of course', all of the electrons align to the north pole when the bricks are fired. I chuckled, agreeing 'of course'.
So can anybody enlighten me as to why this happens or alternatively confirm as I suspect that this is utter horse s
t/the archaeological equivalent of tartan paint?ben5575 said:
Alignment of electrons in bricks
I was talking to an archaeologist (not a detectorist... ) last week who was using a magnasomethingorother ('radar') to survey one of my sites. I asked what it could detect and she went through the various usual things but then mentioned bricks.
Bricks apparently show up very well because, 'of course', all of the electrons align to the north pole when the bricks are fired. I chuckled, agreeing 'of course'.
So can anybody enlighten me as to why this happens or alternatively confirm as I suspect that this is utter horse st/the archaeological equivalent of tartan paint?
Bricks are made of clay which contains minerals which align to a magnetic field when heated (paramagnetism?). So there is some truth to the tale.I was talking to an archaeologist (not a detectorist...
) last week who was using a magnasomethingorother ('radar') to survey one of my sites. I asked what it could detect and she went through the various usual things but then mentioned bricks.Bricks apparently show up very well because, 'of course', all of the electrons align to the north pole when the bricks are fired. I chuckled, agreeing 'of course'.
So can anybody enlighten me as to why this happens or alternatively confirm as I suspect that this is utter horse s
t/the archaeological equivalent of tartan paint?Apropos of all that, did your chuckling acquiescence result in a, erm, result?
Delightful as she was, perhaps more Tony Robinson than Harrison Ford....
Were I cleverer I would make some weak contextual joke about paramagnatism, but let's just say that there may have been some magic in the air
But then of course I am far more HF than TR so I can't blame her*...
Thanks for the answer.
*That may or may not be true...
Were I cleverer I would make some weak contextual joke about paramagnatism, but let's just say that there may have been some magic in the air
But then of course I am far more HF than TR so I can't blame her*...Thanks for the answer.
*That may or may not be true...
GroundEffect said:
Speed 3 said:
singlecoil said:
Is there a theoretical limit to the top speed a propellor driven aircraft could achieve?
Effectively when the tip would go supersonic which will vary in rpm depending on the size of the prop. Same for helicopter blades.Speed 3 said:
singlecoil said:
Is there a theoretical limit to the top speed a propellor driven aircraft could achieve?
Effectively when the tip would go supersonic which will vary in rpm depending on the size of the prop. Same for helicopter blades.Speed 3 said:
Sorry, misread you post, you said aircraft not the propeller itself. Similar limitations when you put in the 3rd dimension of airflow. I suspect the limiting factor is outright power when you consider most jet aircraft need afterburners to break through M1.0 and have pure jet rather than turbofan engines even with limited bypass.
Which current supersonic aircraft have turbojets? Admittedly most of them aren't expected to spend long at over mach 1 but all the ones I can think of have turbofans.Dr Jekyll said:
Speed 3 said:
Sorry, misread you post, you said aircraft not the propeller itself. Similar limitations when you put in the 3rd dimension of airflow. I suspect the limiting factor is outright power when you consider most jet aircraft need afterburners to break through M1.0 and have pure jet rather than turbofan engines even with limited bypass.
Which current supersonic aircraft have turbojets? Admittedly most of them aren't expected to spend long at over mach 1 but all the ones I can think of have turbofans.Another intriguing question. My son is revising the Highway Code and asked me where the sign saying "No inflammables or explosives" would be displayed. I have never seen it, but googling found a picture taken in 2007, and is still on street maps.
It's in Wragby Road Lincoln outside the Peacock pub.
Notice the DYL's on the corner, are drivers that stupid there to park on corners
It's in Wragby Road Lincoln outside the Peacock pub.
Notice the DYL's on the corner, are drivers that stupid there to park on corners
Vipers said:
Another intriguing question. My son is revising the Highway Code and asked me where the sign saying "No inflammables or explosives" would be displayed. I have never seen it, but googling found a picture taken in 2007, and is still on street maps.
It's in Wragby Road Lincoln outside the Peacock pub.
Notice the DYL's on the corner, are drivers that stupid there to park on corners
Just take a trip to the bad parking thread if you really need an answer to that!It's in Wragby Road Lincoln outside the Peacock pub.
Notice the DYL's on the corner, are drivers that stupid there to park on corners
https://www.pistonheads.com/gassing/topic.asp?h=0&...
Vipers said:
Another intriguing question. My son is revising the Highway Code and asked me where the sign saying "No inflammables or explosives" would be displayed. I have never seen it, but googling found a picture taken in 2007, and is still on street maps.
It's in Wragby Road Lincoln outside the Peacock pub.
Notice the DYL's on the corner, are drivers that stupid there to park on corners
I've only heard of it used on the approach to tunnels.It's in Wragby Road Lincoln outside the Peacock pub.
Notice the DYL's on the corner, are drivers that stupid there to park on corners
hairykrishna said:
GroundEffect said:
Speed 3 said:
singlecoil said:
Is there a theoretical limit to the top speed a propellor driven aircraft could achieve?
Effectively when the tip would go supersonic which will vary in rpm depending on the size of the prop. Same for helicopter blades.Halmyre said:
Vipers said:
Another intriguing question. My son is revising the Highway Code and asked me where the sign saying "No inflammables or explosives" would be displayed. I have never seen it, but googling found a picture taken in 2007, and is still on street maps.
It's in Wragby Road Lincoln outside the Peacock pub.
Notice the DYL's on the corner, are drivers that stupid there to park on corners
I've only heard of it used on the approach to tunnels.It's in Wragby Road Lincoln outside the Peacock pub.
Notice the DYL's on the corner, are drivers that stupid there to park on corners
There is a steep hill a few hundred metres further on if that is the reason.
I drive through there every morning. Further down the road there’s a big hill with a sharpish S bend at the top. I always like to imagine a fuel tanker losing it and causing all sorts of spectacular carnage as it rolls off the side of the hill in an enormous ball of flame into the college below 
LordJammy said:
I drive through there every morning. Further down the road there’s a big hill with a sharpish S bend at the top. I always like to imagine a fuel tanker losing it and causing all sorts of spectacular carnage as it rolls off the side of the hill in an enormous ball of flame into the college below
Interesting, could be.Gassing Station | The Lounge | Top of Page | What's New | My Stuff