Bronze valves
I have no idea what any of these valves, gauges, or levers do, and it's tremendously complex -- I expect that learning to operate a steam locomotive took years of apprenticeship under an experienced engineer.
Canon EOS DIGITAL REBEL XTi, f/4.5 @ 22 mm, 1/30, ISO 200, No Flash
© Alan Lapp and Zina Deretsky
