Ventilator

"There was scarcely a thing needed in the business that Durham and Company did not make for themselves. There was a great steam power plant and an electricity plant. There was a barrel factory, and a boiler-repair shop. There was a building to which the grease was piped, and made into soap and lard; and then there was a factory for making lard cans, and another for making soap boxes. There was a building in which the bristles were cleaned and dried, for the making of hair cushions and such things; there was a building where the skins were dried and tanned, there was another where heads and feet were made into glue, and another where bones were made into fertilizer."

Upton Sinclair

The Jungle, 1906