The control room equipment,
monitor, "Racks" and 1936 Camera
The 3 19" bays of control equipment for the Emitron camera, this is were
the term "Racks" is thought to have originated. Note the camera cable
in the lower left corner.
Both the Emitron and the Super Emitron suffered from
shading (an effect similar to lens vignette or port-holing, but much more
pronounced and unpredictable) and spurious signals. Correction waveforms
had to be added to the picture signal to attempt to alleviate the shading.
These waveforms were called "Tilt and Bend" and required frequent
adjustment. Additionally because the electron gun that produced the beam
that scanned the target was to the side a distortion know as "keystone
distortion" also had to be corrected.
The Black plate at the top of the middle rack says "Marconi-EMI television Co. Ltd."
A report in the "Telegossip" section of the 1938 Television & SWW says that the original small green picture monitors have been replaced by larger 8 x 10 inch ones with white screens. See Americanradiohistory page 477.