You know he was more than suspected when the brass Filings were missed, that time.
"Dick Lionheart"
Mary Rowles Jarvis
Branly's work did not attract much attention in England until 1892, when Dr. Dawson Turner described his own repetition of Branly's experiments with the metallic Filings tube at a meeting of the British Association in Edinburgh.
"Hertzian Wave Wireless Telegraphy"
John Ambrose Fleming
The logical development of the single contact is, therefore, the infinite number of contacts existing in the tube of metallic Filings, which has been the form of kumascope most used for many years.
"Hertzian Wave Wireless Telegraphy"
John Ambrose Fleming