Page "Video camera tube" Paragraph 7

Dieckmann and Hell submitted their application to the German patent office in April 1925, and a patent was issued in October 1927.

Their experiments on the image dissector were announced in the volume 8 ( September 1927 ) of the popular magazine Discovery and in the May 1928 issue of the magazine Popular Radio.

However, they never transmitted a clear and well focused image with such a tube.