The 14-foot diameter pipeline of the Montana Power Company, near Great Falls, Montana, one of the two largest continuous stave lines in the western U.S., circa 1918. Photos are marked "Pacific Coast Pipe Co., Seattle."

Source: J. F. Partridge, "Modern Practice in Wood Stave Pipe Design and Suggestions for Standard Specifications," with Discussion, Transactions of the American Society of Civil Engineers, Volume LXXXII, 1918, p. 491.

Source: J. F. Partridge, "Modern Practice in Wood Stave Pipe Design and Suggestions for Standard Specifications," with Discussion, Transactions of the American Society of Civil Engineers, Volume LXXXII, 1918, p. 487.