The cover of the book "Branly, au temps des ondes et des limailles" by Philippe Monod-Broca.

I was happy to encounter this biography of Édouard Branly. He invented the coherer, one of the first semiconductors, essential for the invention of radio. Its working principles are still not fully understood.

#ÉdouardBranly #PhilippeMonodBroca #mediaarcheology #mediaarchaeology #systemsthatmatter