- February 17
- French government of André Tardieu falls. [1]
- February 26
- First red and green traffic lights installed (Manhattan, New York City). [1]
- February 27
- Bouvet Island declared a Norwegian dependency. [1]
- March 6
- Clarence Birdseye is first to put frozen individual packaged food products on sale, in Springfield, Massachusetts, USA. [1] [55.75]
- March 8
- Mahatma Gandhi starts civil disobedience in India. [1]
- March 12
- Mohandas Gandhi begins 200 mile (321 km) march protesting British salt tax. [1] [5]
- March 15
- First seaplane glider flown, at Port Washington, New York. [1]
- First streamlined submarine of US navy, USS Nautilus, launched. [1]
- March
- North German Lloyd's Europa ocean liner takes the title of fastest to cross the Atlantic. [260.49]
- March 20
- Clessie Cummins sets diesel engine speed record of 129.39 kph. [1]
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- March 28
- Constantinople and Angora changes names to Istanbul and Ankara. [1]
- April 1
- Zawditu, first reigning female monarch of Ethiopia, dies. [1]
- April 2
- First New York-Bermuda airplane flight lands in Bermuda. [1]
- April 3
- Ras Tafari becomes Emperor Haile Selassie of Abyssinia (Ethiopia). [1]
- April 6
- First transcontinental glider tow completed. [1]
- April 10
- Synthetic rubber first produced. [1]
- April 11
- Panama passes a law for new coinage of the same size, weight, silver content, and denominations as US coins. [388.B20] [399.22]
- April 17
- Abkhazian ASSR established in Georgian SSR. [1]
- April 21
- Fire (set as part of an escape attempt) at Ohio State Penitentiary kills 320. [1]
- April 22
- US, Britain and Japan sign London Naval Treaty to reduce naval forces. [1]
- April 29
- North Sea floodgate at Ijmuiden (biggest in world) officially opens. [1]
- Telephone connection England-Australia goes into service. [1]
- May 1
- The dwarf planet Pluto is officially named. [5]
- May 12
- Pulitzer prize awarded to Marc Connelly (Green Pastures). [1]
- May 13
- Farmer killed by hail in Lubbock, Texas, USA; this is the only known fatality due to hail. [1]
- May 15
- Ellen Church becomes first airline stewardess, United Airlines (San Francisco to Cheyenne). [1]
- May 16
- 6th Walker Cup: US 10-Great Britain/Ireland 2. [1]
- May 19
- White women win voting rights in South Africa. [1]
- May 20
- First airplane catapulted from a dirigible, with Charles Nicholson as pilot. [1]
- University of California dedicates $1,500 to research on prevention and cure of athlete's foot. [1]
- May 27
- The Chrysler Building opens to the public in New York. At 1,046 feet tall, it is the tallest man-made structure in the world. [5]
- May 28
- Georges Forbes succeeds Joseph Ward as premier of New Zealand. [1]
- May 31
- Building begins on Albert Canal in Belgium. [1]
- June 2
- First baby born on a vessel passing through Panama Canal. [1]
- June 13
- 22 people killed by hailstones in Siatista, Greece. [1]
- June 17
- US President Herbert Hoover signs the Hawley-Smoot Tariff bill into law, increasing some 900 American import duties. [341.125]
- June 24
- First radar detection of planes, Anacostia DC. [1]
- June 30
- First round-the-world radio broadcast, Schenectady, New York. [1]
- August 13
- In Brazil, the "Rio Curaca event", a bolide explosion in mid-air, producing fire and "depopulation". Prior to explosion was "an ear-piercing whistling sound", the sun appeared to be "blood-red", and a fall of fine ash which covered the surrounding vegetation with a blanket of white. [521]
- September 2
- First non-stop airplane flight from Europe to US (37 hours). [1]
- September 3
- Hurricane kills 2,000, injures 4,000 (Dominican Republic). [1]
- September 11
- Stomboli volcano (Sicily) throws 2-ton basaltic rocks two miles. [1]
- September 13
- A fireball plunges into the sea near Eureka, California. [521]
- September 14
- National Socialists gain 107 seats in German election. [1]
- September 15
- First international Bridge (card game) match is held in London, England. US team defeats England. [1] [55.28]
- September 21
- Johann Ostermeyer patents the flashbulb. [1]
- September 29
- Boquerón battle ends Paraguay border dispute. [1]
- October 5
- The R 101 airship from England en route to Egypt crashes in Bois de Coutumes, Beauvais, France and burns completely except for the steel frame, killing 47 including British Secretary of State for Air Lord Thomson. [720.141]
- October 20
- British White Paper restricts Jews from buying Arab land. [1]
- October 30
- Turkey and Greece sign a treaty of friendship. [1]
- November 2
- Ras Tafari crowned Haile Selassie I, 225th emperor of Solmonic Dynasty. [1]
- November 3
- First US vehicular tunnel to a foreign country (Detroit-to-Windsor, Canada) opens. [1]
- November 9
- First nonstop airplane flight from New York to Panama. [1]
- November
- Over 40kg of chondrite meteorites (type CK) fall at Karoonda in Southern Australia. [523.91]
- November 25
- 690 earthquake shocks recorded in one day (Ito, Japan). [1]
- December 3
- Air-borne chemicals combine with fog to kill 60 (Meuse Valley, Belgium). [1]
- Otto Ender forms Austrian government. [1]
- December 4
- French government of André Tardieu falls. [1]
- Vatican approves rhythm method for birth control. [1]
- December 7
- In Boston, Massachusetts, the CBS radio orchestra program is broadcast in video and includes the first television commercial in the United States. [5]
- December 13
- Theodore Steeg forms French government. [1]
- December 22
- Six West Europe lands signs Convention of Oslo. [1]
- December 29
- Fred P Newton completes longest swim ever (1826 miles), when he swam in the Mississippi River from Ford Dam, Minnesota, to New Orleans, Louisiana. [1]
- December 31
- Pontifical encyclical Casti connubii against mixed marriages. [1]
- Year
- US tobacco industry cigarette production during the year: 123 billion. [1]
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