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April 7th 05, 05:53 PM
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On 07/04/2005 8:50 AM, Al wrote:
In article , wrote: We dropped molten solder in a pile of sulpher in a bottle cap. On 5 Apr 2005 20:45:34 -0500, wrote: When I was in high school (many MANY years ago), a classmate of mine "grew" his own crystal by melting (IIRC) lead and sulfur together. It was an ugly-looking mess, but it worked. You were making "galena" which is PbS, Lead Sulfide. I used one for my first crystal radio in the 50's. Had to find a sensitive spot. You might be able to find some in a hobby shop (If you can find one.) that deals with minerals. You might also try a "blue blade" razor blade. The GIs used them in WWII for making foxhole radios. The bluing produced a chemical (unknown to me) that rectified the signal. For this purpose, almost any anodized metal should suffice. The "Blue Blades" were, AFAIK, simply anodized and polished high-carbon steel. The aonodized surface would be covered with fine steel-oxide crystals. I wonder if anodized aluminium would work? I'm theorizing here that we want some sort of crystal to interact with a base conductor. This kind of thing is still done for some special "blue" hack- and reciprocating saw blades. I think there are even circular saw blades that are anodized in a similar way. These would be expensive and hard to come by. I'm sure people will pay to get them rebuilt rather than toss them out, and I have no idea how an average tinkerer might easily cut pieces of a think saw blade up! However, if you can find a hacksaw blade treated in the same manner, this give supplies for a number of experiments. |
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