| The Columbia Encyclopedia, Sixth Edition. 2001-07. |
| Day, Benjamin |
| 1838–1916, American printer; son of Benjamin Henry Day. While working in New York City, Day invented a process, utilizing celluloid sheets, for shading plates in the color printing of maps and illustrations. It is known as the Ben Day, or Benday, process. The term “Ben Day” is used as a noun, verb, and adjective. |
| The Columbia Encyclopedia, Sixth Edition. Copyright © 2007 Columbia University Press. |
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