Starting in 1894, he also taught physics at the Konstantinovsky Artillery School, and from 1906, he lectured on electrical and magnetic measurements as part of women's polytechnic courses.

Rosing recognized the shortcomings of mechanical television; he thought that the image should be displayed electrically on a cathode-ray tube (CRT).

By 1902, Rosing began actual experimentation to test his ideas: he constructed a simple apparatus for electrically deflecting the beam of a CRT, which allowed him to draw figures on the tube's screen.

At that time, mechanical devices scanned an image onto a selenium photoresistor, the resistance of which varied in response to the light striking it.

Accordingly, Rosing's system employed a mechanical camera device, but used very early CRTs (developed in Germany by Karl Ferdinand Braun) as a receiver.

Rosing's Braun Tubes consisted of two parallel metal plates that were used to electrically shift the electron beam itself before it was scanned and reached the screen.

[11] In 1925, B. Rosing advised and helped young inventor Boris Grabovsky apply for a patent (issued under No 5592) of a fully electronic TV set, called Telefot.

[12] Rosing continued his television research until 1931 when he was exiled as a counter-revolutionary to Kotlas without right to work, but in 1932 was moved to Archangelsk, where took up physics at the Forestry Technology Institute.