I could watch this 4-cylinder Miller engine all day. One of the beautiful engines at the Coolspring Power Museum in Coolspring, Pennsylvania. The Miller Improved, built in Springfield in 1913, is a 300-horsepower engine with a four-cylinder “H” style design. It was originally installed at the Spring Creek station near Kane, Pennsylvania, powering an air compressor that served local oil wells until 1976, when it was relocated to the museum. Today, this impressive 35-ton machine operates during sh