Lastly we have the electrolytic interrupters, the first of which was introduced by Dr. Wehnelt, of Charlottenburg, in the year 1899, and modified by subsequent inventors.
"Hertzian Wave Wireless Telegraphy"
John Ambrose Fleming
French inventors at about the same time were carrying on successful experiments with machines similarly constructed.
"History of the United States, Volume 6 (of 6)"
E. Benjamin Andrews
He was one of the inventors of photography and the first who applied it to astronomy.
"A Biographical Dictionary of Freethinkers of All Ages and Nations"
Joseph Mazzini Wheeler