Monotype Factory {photo}

monotype-factory-philadelphia

More about this building at 24th & Locust {design traveler}:

In 1887 Tolbert Lanston designed the Monotype prototype which required two pieces of equipment, a keyboard and a metal typecaster. The process began with an operator typing the text using a keyboard of 276 keys, the amount required to cover all of a font variants such as italic, bold, etc.  Each key strike triggered a number of holes punched along the length of a 4-inch wide paper ribbon. The typecasting machine used the perforated ribbon to dictate the specific order in which individual metal letters were cast from a brass a matrix.