1968.123.012
Lithograph
St. Mary's Falls Canal,
The Valves and Valve Engines.
The Accumulator.
Plan sheet (sheet 12 of 17) from a set of lithographs that shows St. Mary's Falls Canal & Locks at Sault Ste. Marie, Michigan. This sheet, Plate 10, is entitled "St. Mary's Falls Canal" and "The Valves and Valve Engines" as well as "The Accumulator." The sheet shows plan and profile views of the valve machinery and also the accumulator weight which were used in the control and operation of the lock gates. The drawings and text are printed in black ink on slightly yellowed paper that has a black borderline. Small printed text at the lower right corner shows "N. Peters. Photo-Lithographer, Washington, D.C."
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