On this day: Edwardian London from the air

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7th November 1909: English scientist Norman Lockyer photographed London from the air with a use of a helium balloon. This image shows Sloane Square, on the boundaries of the Knightsbridge, Belgravia and Chelsea districts.

Lockyer, who – along with French scientist Pierre Janssen – was credited with discovering helium, was seventy-three at the time the photograph was taken.