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Summary
| Description |
A U.S. Census Bureau clerk (left) prepares punch cards using a pantograph similar to that developed by Herman Hollerith for the 1890 Census, while a second clerk (right) uses a 1930s key punch to perform the same task more quickly. The agency used punch cards to record and sort data using mechanical tabulators based on Hollerith’s designs until replacing them with computers and magnetic computer tape in the 1950s. |
| Date | circa 1940 |
| Source | https://www.census.gov/history/ |
| Author | U.S. Census Bureau employees |
Licensing
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This image or file is a work of a United States Census Bureau employee, taken or made as part of that person's official duties. As a work of the U.S. federal government, the image is in the public domain.
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 02:42, 18 July 2017 | | 2,860 × 2,290 (1.09 MB) | ArnoldReinhold | User created page with UploadWizard |
File usage
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