Walking-beam engines and American path dependence

Walking-beam engines placed their large beam high above the machinery and worked efficiently in shallow-draft vessels. USS Delaware, built in 1861, shows that necessity could carry this exposed arrangement into a warship despite its obvious vulnerability. American engineers kept refining the type because it continued to work well in the shallow-water environments for which it was suited. Shipbuilder Charles H. Cramp criticized that success as a form of path dependence: continuing to improve a proven system discouraged experiments with newer alternatives. Cramp argued that American marine engineering had fallen roughly two generations behind British practice, making this a useful case study in how local advantages can become an industrial constraint.