Example image of eyePlorer eyePlorer map for '1931': Common year starting on Thursday Gregorian calendar Roman numerals Cyclotron Ernest Lawrence January 2 Nuclear physics Elly Beinhorn January 4 January 6 Patent Thomas Edison Australia Governor-General of Australia Isaac Isaacs January 22 India January 25 Mohandas Karamchand Gandhi January 27 Pierre Laval Charlie Chaplin City Lights January 30 1931 Hawke's Bay earthquake February 3 New Zealand Richter magnitude scale February 10 New Delhi February 12 Vatican Radio Béla Lugosi Dracula (1931 film) February 14 February 16 Finland Pehr Evind Svinhufvud California February 20 San Francisco – Oakland Bay Bridge United States Congress February 21 Flyer (pamphlet) Ford Trimotor Lima Peru Propaganda March 1 USS Arizona (BB-39)
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