Was a very interesting article on Henry Corliss! I live in Ohio and most states require you to have a stationary steam engineers license to operate steam turbines and engines. I'm 73 years old and have a state of Ohio license and a national first class power engineer license. The first job I had after receiving my license (at the age of 25) was to operate 16 large twin cylinder 14' diameter fly wheel Corliss steam engines and a couple of turbines. These were used to pump CO2 gas to a process for carbonation. Sadly these were replaced by three 3500 HP electric drive centrifugal compressors in 1968. We were a very large chemical plant with one of the largest industrial power houses in Ohio. We burned 100 ton of coal per hour and generated 85 MW of electricity. After 3 years I became a foreman in our powerhouse and eventually moved in to the position of foreman of all turbo-generation and plant electrical distribution systems. I retired with 42 years of service with the same company, which is unheard of these days. As with most large industry, this plant has been reduced to a fraction of what it used to be. All of the old plant, including the power plant has been torn down and grass planted in its place. It's sad to see what has become with our country and how much power the rich environmental groups have, just don't mess with their hypocritical life style. As I look back I always remember the Corliss steam engines with fondness the most. The dash pots on the valve system was a stroke of genius in itself, using a vacuum was a much faster way to assist the valves. I love the Henry Ford museum where you can see some of these past wonders Thank you, George Kelley.