The Edgar Wallace Mystery Theatre

The telephone played an important role in The Edgar Wallace Mystery series. However, the standard British phone ring of the day comprised two steady rings with a cadence of 0.4 sec on, 0.2 sec off, 0.4 sec on, then 2 sec off. Presumably, to save time and inject a sense of urgency into the proceedings, British telephone rings in both this and many other presentations of the day were frequently speed-up, sometimes to twice the normal rate.

In US each episode was cut to 45 minutes to fit hour-long commercial TV slots.