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| 1930 |
| | | US inventor Richard Drew develops Scotch Brand Cellulose Tape, the world's first transparent tape | |
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| 1931 |
| | | Geoffrey De Havilland designs the Tiger Moth, on which nearly all British pilots were trained during World War II | |
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| 1931 |
| | | The George Washington Bridge links New York with New Jersey, and is the world's longest suspension bridge with a main span of 3500 feet (1066m) | |
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| 1932 |
| | | One of the defining landmarks of Sydney, in Australia, is opened – the single-span steel arch bridge across the city's harbour | |
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| 1932 |
| | | US aviator Amelia Earhart lands in Ireland 15 hours after leaving Newfoundland, to become the first woman to fly solo across the Atlantic | |
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| 1933 |
| | | Polish cryptographers succeed in breaking some of the Enigma code used by the German military | |
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| 1935 |
| | | The mighty Boulder Dam (renamed Hoover Dam in 1947) is completed on the Colorado River | |
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| 1935 |
| | | US industrialist Howard Hughes sets a new speed record of 352 mph, flying a plane designed by himself | |
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| 1936 |
| | | The prototype of the Spitfire, designed by Reginald Mitchell, has its first test flight | |
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| 1937 |
| | | The German airship Hindenburg bursts into flames over New Jersey, bringing to an end the era of rigid airships | |
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