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- Tripod coherer, built by Branly in 1902, another imperfect contact type. Although most coherers functioned as "switches" that turned on a DC current from a battery in the presence of radio waves, this may be one of the first rectifying detectors, because Branly reported it could produce a DC current without a battery. (en)
- One of the first coherers designed by Édouard Branly. Built by his assistant. (en)
- Another tripod detector built by Branly (en)
- A "ball" coherer, designed by Branly in 1899. This imperfect contact type had a series of lightly touching metal balls set between two electrodes. (en)
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