I happened to notice this article from The Stage on the BNA whilst
looking for Elstree War Memorial in the BNA.
No idea what "Interswitch" is or was but the article could be of
interest to some people. The BNA should be accessible in many good
libraries to anyone interested if they do not have a subscription.
'INTERSWITCH'-BBC LEADS!
On the technical side by KENNETH ULLYETT
A HIGH Official of the BBC has taken me to task. I do not complain. I am
here to be shot at!
He alleges that in my recent column titled "Flying Spot, Off to a Flying
Start I made the situation a laughing-stock as, according to this High
Official "the BBC has been doing flying-spot telecine for years.''
Let me avoid any further misunder-standing by saying that nobody
dis-putes for one moment the pioneering work BBC have done in television engineering in general, and in telecine in particular. Nor does anyone
pretend that the flying-spot principle is new.