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A 15th century French painting depicts an ancient stone tool (phys.org)

More than 500,000 years ago, our human ancestors used large, stone tools known as “Acheulean handaxes,” to cut meat and wood, and dig for tubers. Often made from flint, these prehistoric oval and pear-shaped tools are flaked on both sides and have a pointed end....

Microvawe transformer spotwelder. Is there a way to improve it?

Hi, I have built a microvawe transformer spotwelder, I have put a single turn of welder wire for in the secondary and I’m timing it with arduino. Worth mentioning it was/is a 230V transformer. Electrodes are sharpened copper rods. I believe the voltage is still high. The spotwelds it produces are slightly discolored and not as...

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