This photograph shows a white substance moving along an assembly line. This could be a stage in the soap making process at Procter and Gamble, though more information is needed to be certain. The Procter and Gamble Company Plant, located on Spring Grove Avenue between Mill Creek and Township Avenue, originally covered 11 acres in a section called Ivorydale. It was and still is, one of the largest soap manufacturing plants in the world. The original plant dates from about 1885, when P&G expanded operations from their downtown location. The giant complex would eventually cover 243 acres with 120 buildings, including the 43 acre food plant built in 1911. During the 1930s, the buildings was described as being a maze of utilitarian gray s...