Baird television exhibit at Radiolympia, London, c 1930.

Set of 16 prototype electrodes for applied potential tomography (APT), 1987.

Set of 16 prototype electrodes for applied potential tomography (APT), 1987.

Set of 16 prototype electrodes for applied potential tomography (APT), 1987.

John Logie Baird John Logie Baird (1888-1946), television pioneer, 20 December 1940.

Robert Rattray Tatlock, Scottish chemist, late 19th century/early 20th century.

Baird disc model televisor, 1930.

Electrode.

Electrode with six-pronged rake end.

Graphite electrode. Light micrograph in cro

Graphite Electrode. Light micrograph in cro

John Logie Baird c 1930's.