1. Credit: Gift from Herbert A. French, Library of Congress

In 1914, when this photo was taken, $4.5 million was dried daily in a room that hot air circulated through.
Photos: How Dollar Bills Were Made A Century Ago

    Credit: Gift from Herbert A. French, Library of Congress

    In 1914, when this photo was taken, $4.5 million was dried daily in a room that hot air circulated through.

    Photos: How Dollar Bills Were Made A Century Ago