Magnetic weapons

Jens Nordlunde · 6th May 2006, 09:31 PM

Hi Katana,
Maybe you should go back to the start and look through the mails - then you will see that it has been done.

Jens

katana · 6th May 2006, 09:37 PM

That'll teach me not to skip through threads, my apologies.

Jens Nordlunde · 6th May 2006, 09:45 PM

Don't worry, I do it now and again as well

.

Jens

Rivkin · 29th May 2006, 09:43 PM

Attached is a numerically simulated magnetization in 15x2cm FeNi sample, rapidly cooled from Curie temperature.

a. The magnetization is parallel to the local direction of the magnetic field, therefore the paper and iron dust would procuce a similar picture if placed on top of this sample.

b. Equilibrium configuration is a result of such things as a competition between exchange and dipole-dipole interactions for a given shape.

c. The loss of precise magnetization is more or less a smooth function of temperature. Since Fe has Curie temperature of about 1000K (700C) it is not that noticable at the room temperature, but becomes an essnetial issue when you heat any sample to 500-600C. Initial magnetization, i.e. whether magnetized or unmagnetized iron has been used, becomes at this point mostly irrelevant.

d. The attached simulation was performed in the absence of external fields. Earth's magnetic field is truly irrelevant since it is extremely small; on the other hand the presence of other magnets like magnetized anvil and so on could have made the magnetization to be more uniform.

Rivkin · 19th September 2006, 01:00 AM

Richard Burton in his "book of the sword" tells us that ancient greeks believed magnets to posess healing properties and weapons, made from magnets to be extremely deadly.

Jens Nordlunde · 14th October 2006, 10:01 PM

Hi Rivkin,

I just saw your last two mails. No 114 I only understand part of, but that is not your fault, and what I understand is interesting. The last mail made me remember something from my childhood – I was told that if someone were cut with a magnetic knife, the wound would heal very slowly, if at all. The Indians seemed to mean that weapons made of lodestone, had a special meaning/force, as did many of the other peoples living in the area.

Rivkin · 22nd October 2006, 04:45 AM

Thank you very much,

Here is what I found rereading my books:

Adzhaib Ad'Dunia "The miracles of the world"
"Indians have a miracle steel... Magnets do not attract it...If you make a sword out of it and kill someone with it, no blood will spill, the arrows made from it can penetrate stone, it does not get hot in fire... It is used to make swords of indian rulers... they do not export it, searching all the traders for it when they leave..."

6th May 2006, 09:45 PM	#3
Jens Nordlunde Member Join Date: Dec 2004 Location: Europe Posts: 2,718	Don't worry, I do it now and again as well. Jens

29th May 2006, 09:43 PM	#4
Rivkin Member Join Date: Dec 2004 Posts: 655	Attached is a numerically simulated magnetization in 15x2cm FeNi sample, rapidly cooled from Curie temperature. a. The magnetization is parallel to the local direction of the magnetic field, therefore the paper and iron dust would procuce a similar picture if placed on top of this sample. b. Equilibrium configuration is a result of such things as a competition between exchange and dipole-dipole interactions for a given shape. c. The loss of precise magnetization is more or less a smooth function of temperature. Since Fe has Curie temperature of about 1000K (700C) it is not that noticable at the room temperature, but becomes an essnetial issue when you heat any sample to 500-600C. Initial magnetization, i.e. whether magnetized or unmagnetized iron has been used, becomes at this point mostly irrelevant. d. The attached simulation was performed in the absence of external fields. Earth's magnetic field is truly irrelevant since it is extremely small; on the other hand the presence of other magnets like magnetized anvil and so on could have made the magnetization to be more uniform. Attached Images

6th May 2006, 09:31 PM	#1
Jens Nordlunde Member Join Date: Dec 2004 Location: Europe Posts: 2,718	Hi Katana, Maybe you should go back to the start and look through the mails - then you will see that it has been done. Jens

6th May 2006, 09:37 PM	#2
katana Member Join Date: Jan 2006 Location: Kent Posts: 2,658	That'll teach me not to skip through threads, my apologies.

19th September 2006, 01:00 AM	#5
Rivkin Member Join Date: Dec 2004 Posts: 655	Richard Burton in his "book of the sword" tells us that ancient greeks believed magnets to posess healing properties and weapons, made from magnets to be extremely deadly.

14th October 2006, 10:01 PM	#6
Jens Nordlunde Member Join Date: Dec 2004 Location: Europe Posts: 2,718	Hi Rivkin, I just saw your last two mails. No 114 I only understand part of, but that is not your fault, and what I understand is interesting. The last mail made me remember something from my childhood – I was told that if someone were cut with a magnetic knife, the wound would heal very slowly, if at all. The Indians seemed to mean that weapons made of lodestone, had a special meaning/force, as did many of the other peoples living in the area.

22nd October 2006, 04:45 AM	#7
Rivkin Member Join Date: Dec 2004 Posts: 655	Thank you very much, Here is what I found rereading my books: Adzhaib Ad'Dunia "The miracles of the world" "Indians have a miracle steel... Magnets do not attract it...If you make a sword out of it and kill someone with it, no blood will spill, the arrows made from it can penetrate stone, it does not get hot in fire... It is used to make swords of indian rulers... they do not export it, searching all the traders for it when they leave..."