Herman Hollerith, a German-American statistician, inventor, and businessman, stands as a pivotal figure in the early development of data processing. Born in 1860, Hollerith's ingenuity led to the creation of an electromechanical tabulating machine that utilized punched cards. This invention, patented in 1884, marked a significant turning point, ushering in the era of mechanized binary code and semiautomatic data processing systems. His fundamental
concept would dominate the landscape of data handling for nearly a century, laying the groundwork for future technological advancements.
The Birth of the Punched Card System
Hollerith's journey into invention began around the time he left teaching to work for the United States Census Bureau. It was during this period that he filed his first patent application on September 23, 1884, titled "Art of Compiling Statistics." This patent, officially granted as U.S. Patent 395,782 on January 8, 1889, detailed a revolutionary method for compiling statistics. The core idea involved recording individual statistical items by punching holes or combinations of holes into sheets of electrically non-conducting material. These perforations bore a specific relation to each other and to a standard, allowing for the counting or tallying of statistical items, either separately or in combination, through mechanical counters operated by electromagnets. The circuits for these electromagnets were controlled by the perforated sheets themselves.
The inspiration for this system, particularly the use of electrical connections to increment a counter, came from a suggestion by John Shaw Billings. A key insight was that data could be represented by the presence or absence of a hole at a specific location on a card. For instance, a hole at a particular spot could indicate a married status, while the absence of a hole could signify single. Hollerith realized that data arranged in rows and columns at specified locations on a card could be efficiently counted or sorted electromechanically. He submitted a description of this system, titled "An Electric Tabulating System" (1889), as his doctoral thesis to Columbia University, further solidifying the academic and practical foundations of his invention.
Revolutionizing the 1890 U.S. Census
Initially, Hollerith conducted business under his own name, operating as The Hollerith Electric Tabulating System. His company specialized in punched card data processing equipment, and he secured a contract with the Census Office to provide tabulators and other machines for the 1890 census. The impact of his electromechanical tabulators on the 1890 census was profound. Compared to the 1880 census, which took eight years to process, the 1890 census was completed in just six years. This reduction in processing time was achieved despite several complicating factors, including a larger population, an increased number of data items to be collected, a higher Census Bureau headcount, and a greater volume of scheduled publications.
Hollerith's machines were not only instrumental in the U.S. but also gained international recognition. Major census bureaus worldwide leased his equipment and purchased his specialized cards. His tabulating machines were employed for censuses in various countries, including England & Wales, Italy, Germany, Russia, Austria, Canada, France, Norway, Puerto Rico, Cuba, and the Philippines. They were also utilized again for the 1900 U.S. census, demonstrating the widespread adoption and effectiveness of his system. This early success underscored the transformative potential of mechanized data processing and established Hollerith as a pioneer in the field.
Advancements in Tabulating Technology
Beyond the initial tabulating machine, Hollerith continued to innovate, developing crucial components that further enhanced data processing capabilities. He invented the first automatic card-feed mechanism, which streamlined the input process, and the first keypunch, simplifying the creation of punched cards. The 1890 Tabulator was specifically hardwired to handle the cards designed for the 1890 Census. However, Hollerith recognized the need for greater flexibility. His 1906 Type I Tabulator introduced a control panel that simplified the rewiring process for different jobs, making the machines more adaptable. Later, the removable control panel of the 1920s allowed for prewiring and nearly instantaneous job changes. These inventions formed some of the foundational elements of the data processing industry, and Hollerith's punched cards, which later served as computer input/output, remained in use for almost a century, a testament to their enduring utility and his visionary contributions.
