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1900-1909

1900-1909. 1900. 1909.

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1900-1909

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  1. 1900-1909 1900 1909 • American statistician Herman Hollerith (1860–1929) built one of the world's first practical calculating machines, which he called a tabulator, to help compile census data. Then, as now, a census was taken each decade but, by the 1880s, the population of the United States had grown so much through immigration that a full-scale analysis of the data by hand was taking seven and a half years. The statisticians soon figured out that, if trends continued, they would run out of time to compile one census before the next one fell due. Fortunately, Hollerith's tabulator was an amazing success: it tallied the entire census in only six weeks and completed the full analysis in just two and a half years. • Numeric key punch, The Tabulating Machine Co., New York City.  A similar keypunch, which was patented in 1901 (US Patent No. 682,297), was used for the 1900 US Census.  These machines punched round holes in 45-column cards.

  2. 1910-1919

  3. 1920-1929

  4. 1930-1939

  5. 1940-1949 1949 1940

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