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Old 23rd Jan 2004, 7:03 pm   #1
David G4EBT
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Default Wood's Metal?

I beleive that " Woods Metal " is an amalgum that melts at low tempeatrures, and was often used for mounting crystals in their holders.

I see on the net that it's still available (though in commercial quantities) and is used for such things as monting gemstones for polishing etc.

Does anyone know if it's avaiable in small quantities for occasional use by constructors please, and how it's applied to crystals?


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Last edited by Jeremy M0RVB; 2nd Jan 2005 at 12:39 am.
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Old 23rd Jan 2004, 9:36 pm   #2
jmshep
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Default Re: Wood's Metal?

Try this site:
http://earlywireless.com/radio_crystals_for_sale.htm

 
Old 24th Jan 2004, 4:22 am   #3
Paul_RK
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Default Re: Wood's Metal?

" A small, flat tin lid, containing water up to about 1/4 in., is placed on a gas-ring or over a bunsen burner. Any metallic object, such as a nut, is then immersed in the water so that its upper surface projects above the liquid. The crystal cup is placed upon the nut. By this means, not only will the temperature of the cup never become higher than the boiling point of water so long as any water remains in the tin, but the lacquer in the crystal cup will not be ruined.

The gas being lighted, the water is brought to boiling point, when the end of a strip of Wood's metal is placed upon the cup... When the cup is about two-thirds full of molten metal, take the crystal in a pair of forceps, turn the gas out, and then insert the crystal in the cup, holding it there until the metal has set. "

-Harmsworth's Wireless Encyclopedia. The original and still the best. Don't burn your fingers...

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