Coherer

Combination of Branly’s coherer and Sir Oliver Lodge’s decoherer, fitted to a circular wooden base, made by Alex Steuart for wireless reception, Edinburgh, Scotland, c. 1892

Coherer

Lodge point contact coherer, an early form of coherer made of two brass rods in light contact, mounted on a glass insulating rod on a rectangular wooden base, developed two years after Heinrich Hertz demonstrated transmission using radio waves, used by Sir Olver Lodge, maker unknown, England, c. 1890

Wireless telegraphy set

Coherer, part of a demonstration wireless telegraphy set, by George Carette and Co., Nuremburg, Germany, c. 1900

Coherer

Coherer of metal and glass, Marconi's version of Branly's coherer, coherers were used in his early tests from around 1896 to 1899 and again in 1901 to send a radio signal across the Atlantic, by Marconi, Chelmsford, Essex, 19 December 1898