wa8yxm wrote:
I read up on how to make one of those in the high School library when I was in high school... Graduated in 1968. It was an old book then.
How to make:
Take two wires, different metals, (Too many years but I think Copper and iron should do) cut a bunch of six inch lengths.
Make them into a daisy so that all the / wires are copper and all the \ are iron
/\/\/\/\/\/\/\/\/
Form into a circle
heat the center
Measure voltage at the ends.
The number of junctions determins voltage, I recommend a blocking diode (Electrical check valve) The important thing is one pair of wire ends (Copper/Iron) gets hot, the other (Outer ring) does not.
I did basically the same thing in high school Physics class in '57.
A Bunsen burner would give ~9 Volts at ~40 mA.
A Coleman® lantern would give 9 Volts at ~100 mA.
Used it to power a 40 Meter QRP CW transmitter.
