By the late 1800s, some mechanization had come to the lumbering industry. This portable steam engine could be towed by horses to a convenient site and a moveable sawmill assembled. The belts on this engine would then power the blades. A few days or weeks later, the whole kit could be moved closer to the cut.
Welcome to all. I began blogging Retained-Images in 2004 at My-Expressions.com. It is gone now.