Tilt-hammer
Used for shingling, and also for working finished iron. It consists of a long lever, with hammer-head attached at one end, which is operated by a cam at the other. The fulcrum is placed nearest to the cam, which is generally a wheel with about a dozen projections, called wipes. As the cam revolves, the short end of the lever is borne down by the wipes, lifting the hammer-head until the wipe on the cam has cleared, when the hammer drops upon the work on the anvil. Each wipe in succession engages the lever, causing the hammer to rise and fall with considerable force and rapidity.