The EMI Super Emitron Television
Tube
Through the glass bulb the rectangular target mosaic can be seen rotated
from the horizontal, this is to correct for the rotation of the electron
image in the magnetic field applied to the image section.
The Super Emitron had an Image Section in front of
the target and this meant that the image from the lens was formed on
the smaller photo target which was much nearer the lens thus removing
many of the constraints suffered by the Emitron lenses. Additionally
it was some 10 times more sensitive (200 Lux @ f2) enabling the use of
telephoto lenses in poor light conditions.
A fuller description of the operation of the Super Emitron tube can be
found in Wikipedia and
in Television Engineering,
by Amos & Birkinshaw, pub. by ILiffe 1953, pages 68 to 78.
The Super Emitron tube was patented by Lubszynski,
H. G. and Rodda, S. in 1934.
British Patent No. 446661