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I don't have enough context to write an accurate overview of "1840." The context provided only indicates it's a year, but doesn't explain what specific event, work, or phenomenon you're referring to. Could you provide additional details about what aspect of 1840 you'd like me to describe?
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May 6: The world's first postage stamps are introduced. February 10: Queen Victoria of Britain marries Prince Albert of Saxe-Coburg and Gotha.
January 13: Steamship Lexington sinks. 1840 (MDCCCXL) was a leap year starting on Wednesday of the Gregorian calendar and a leap year starting on Monday of the Julian calendar, the 1840th year of the Common Era (CE) and Anno Domini (AD) designations, the 840th year of the 2nd millennium, the 40th year of the 19th century, and the 1st year of the 1840s decade. As of the start of 1840, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.