On 14 Aug 2005 10:19:26 -0700, "Polymath"
wrote:

About 40 years ago, I recall as a teenager borrowing
a book from the local library that described how to
make your own transistor radio, including the manufacture
of the transistors themselves by point-contact
techniques. ISTR that it was published in Yankland.

Does anyone here remember this book?

We used to make crystal for radio by dropping sulpher in molten
solder. LeadSulphide?