Day, Benjamin,1838–1916, American printer; son of Benjamin Henry DayDay, Benjamin Henry,
1810–89, American journalist. He learned the printer's trade in the office of the Springfield (Mass.) Republican and opened a printing office in New York City.
..... Click the link for more information. . 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.