School Intercom - from our story 'On This Day In Photos: October 7th In The 20th Century'

7th October 1954: Schoolteacher Jean Breht switches on the loudspeaker in her classroom at London County Council's first comprehensive high school at Kidbrooke in Greenwich. (Photo by Harry Todd/Fox Photos/Getty Images)

7th October 1954: Schoolteacher Jean Breht switches on the loudspeaker in her classroom at London County Council's first comprehensive high school at Kidbrooke in Greenwich. (Photo by Harry Todd/Fox Photos/Getty Images)

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