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"Striking machines are now very generally used for the operation. These consist of a drum or cylinder having a parallel series of projecting knives, or plates of gun-metal, set angularly across its surface. Underneath the drum is a brass bed, fixed on a yielding cushion, which can be pressed up or eased by means of a foot lever, according as the leather operated on is thick or thin." —The Encyclopedia Britannica, 1910

Striking Machine

"Striking machines are now very generally used for the operation. These consist of a drum or cylinder…