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1925
 
   
The German navy adapts a civilian encryption machine, Enigma, for military purposes      
1926
 
    
John Logie Baird gives the world's first demonstration of television to a group assembled in his attic rooms in London       
1926
 
    
Russian World War I pilot Sergey Ilyushin begins a distinguished career as an aircraft designer       
1927
 
    
US aviator Charles Lindbergh, in his single-engine plane Spirit of St Louis, flies solo across the Atlantic from New York to Paris       
1928
 
    
British inventor John Logie Baird secures a patent for fibreoptic imaging       
Fibre optic gastroscopy, 1998
Wellcome Library, London
1929
 
    
The British Broadcasting Corporation uses Logie Baird's system for its first trial TV broadcasts       
1929
 
    
US explorer Richard E. Byrd and two companions make the first flight over the South Pole, in a Ford Tri-Motor       
1930
 
    
British inventor Frank Whittle takes out a patent for a jet engine       
Sketches towards the design of Whittle's jet engine
National Archives, Kew
1930
 
    
English pioneer aviator Amy Johnson makes a 19-day solo flight in a Gipsy Moth from Croydon (part of London) to Darwin, Australia       
Amy Johnson sheet music, c.1930
Mary Evans Picture Library

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1930
 
    
The airship R101, designed by a UK Air Ministry team, explodes on its maiden vogage, killing all but four of those on board