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William Siemens's greatest single invention was the regenerative furnace.
The Siemens-Martin open-hearth furnace converted steel in a bath of liquid pig-iron
The most appealing characteristic of the Siemens regenerative furnace is the rapid production of large quantities of basic steel. The usual size of furnaces is 50 to 100 tons.
The Siemens-Martin process was slower, and thus easier to control, than the Bessemer Process, so it complemented rather than replaced it.