Title reads: "Behind the Scenes in an "O.B." (outside Broadcast)".
Intertitle reads: "In the distance lofty "2 L.O" - ? Shot of rooftops, building with two radio masts on top. Tilt down to show the two masts. Views of the transmitting room - engineers, changing valves, overhauling panels etc. On location, engineers wiring up special lines needed for the outside broadcast. Inside a London Cinema Theatre the curtains open and we see a large seated audience singing a song. We can see a conductor in the pit. Another view of the pit with two violinists visible, the conductor and recording equipment. An animation depicting the words of Three Blind Mice appears on screen. Mice and cat featured. More shots of the audience and orchestra. Microphones and line amplifiers are shown. In the transmitting room they are watching the valves. Shot of the mast from below. Audience applaud.
Was a Pathe Pictorial item.
Safety print exists
Note: nice footage for illustrating how radio was broadcast in the mid 1920s. Nice shots of men at work at the BBC (B.B.C. British Broadcasting Corporation). Good shots of theatre audience too.