File:Punchcard2.jpg
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Figure 2. Tabulating and sorting apparatus This illustration from U.S. Patent 395,781 (filed by Hollerith in June 1887) is the same as equipment used to process the census of 1890, except that the census equipment had 26 rather than 22 compartments in the sorter and 10 rather than 8 counter dials in each of the 4 rows. Also the boards of electrical posts (P3 and P7) were out of sight, and the array of counter dials was directly behind the table.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 18:37, 7 January 2013 | | 1,828 × 1,246 (1.27 MB) | Administrator1 (talk | contribs) | |
| 15:42, 13 November 2009 |  | 300 × 229 (17 KB) | Nbrewer (talk | contribs) |
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