[COFF] Mercury delay lines

ABC-TV "Grantchester" (a detective-priest series[*]) featured someone who died from mercury poisoning, when someone opened the tanks. Apart from the beautiful Teletype in the foreground, there was a machine with lots of dials in the background; obviously some early computer, but not enough footage for me to tell which one, but is a British show if that helps. [*] I suppose that I need not remind any Monty Python freaks of these lines: "There's another dead bishop on the landing, Vicar-Sergeant!" "Err, Detective-Parsons, Madam." Etc... Otherwise I'd go on all day :-) -- Dave