Semiconductor history

Tins for detector crystals for radios circa 1920 - although branded with lots of made up names, most of the crystals were in fact galena

The use of natural semiconductors

I've started collecting remnants from the era of crystal radio (1900-1930) partly to use to explain what I'm doing in performances but mostly to learn some of the lost history of this technology. There is plenty of information out there, but a lot of the practical details are missing.