Making Clouds

Image of two blast furnaces in a row, seen from the side, with cutaway sections of the interiors of the blast furnaces and accompnaying stoves.
Making Clouds. Screen print on paper. 5 in. x 8 in.
My father, a designer, can recall his 1970s youth when his own father designed pipes for the Bethlehem Steel works. The pipes were a part of new environmental structures to limit air pollution. They would have been right in my grandfather's wheel house, since most of his work as a company draftsman-engineer was on pipes for the steel plant.
Detail of electrostatic precipitator structure.
Detail: Making Clouds: The electrostatic precipitator.
One structure that used these pipes, according to my grandfather and depicted in this drawing: the electrostatic precipitator. This structure "removes particles from a gas stream by using electrical energy to charge particles either positively or negatively" (US EPA Air Emissions Monitoring Knowledge Base) and sticks them to oppositely charged plates within its walls.
Detail of brick stoves structures.
Detail: Making Clouds: The brick stoves that would heat air before being pumped into the blast furnace to make steel.
But a careful environmentalist would note that the use of an electrostatic precipitator (ESP) predates the air pollution uproar of the 70s. ESPs are useful not only because they (partially) keep hazardous particles out of the air, but also because they reclaim a small amount of valuable metal lost in whatever industrial process they're attached to ("History," Research Corporation for Science Advancement).
Detail of blast furnace structure.
Detail: Making Clouds: The blast furnace, where coke, limestone and iron were heated to temperatures high enough to make steel.
Bethlehem Steel had a sufficient interest in this purpose to install them at its plants well before the national air quality regulations of the 70s (Air Pollution Control in the Bethlehem Steel Company, Brandt, 1954).