CALZECCHI ONESTI INVENTOR: RADIO CENTENARY 1v mnh
Catalog #: Sassone #2055
Condition: CALZECCHI ONESTI INVENTOR: RADIO CENTENARY 1v mnh
Item Id #: 3340
3 in stock
Calzecchi demonstrated in experiments in 1884 through 1886 that iron filings contained in an insulating tube will conduct an electrical current. This discovery was the operating principle behind an early radio wave detector device called the coherer, developed by Oliver Lodge, Edouard Branly, and Guglielmo Marconi, which was crucial in the development of radio.