Marconi MkIV camera 315° view side open  
Marconi MkIV camera 315 side open
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The Marconi Mk IV camera shown with the side panel open with the linescan chassis for the tube and viewfinder tube. The fold out crank handle used to open the camera for a tube change can be seen at the lower front of the camera.

There is a paper in the Journal of the Brit.I.R.E Vol. 20 page 105 by A.N. Heightman describing the use of a Tranductor for stabilised power supplies. This detailed paper descibes the theory and practice of the transductor as used in the Marconi Mk IV power supply.