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“A self-acting screw-cutting lathe with double-geared headstock, of a type now well established, the arrangements for obtaining and varying this traversing motion may be observed. A steel leading screw runs along the front of the lathe bed, and with it the slide rest can be connected at pleasure. Two or more change wheels, properly proportioned as to the number of their teeth, connect the head of the screw with the hinder end of the mandrel.” —The Encyclopedia Britannica, 1903


The Encyclopedia Britannica, New Warner Edition (New York, NY: The Werner Company, 1893)


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