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Towards the end of 1904, a few small four-cylinder air-cooled engines were produced to provide compact, smooth-running power units for motorcycle propulsion. Among these designs were the F.N., the Binks, the Durkopp and the Laurin and Klement. The F.N., designed by Paul Kelecom and made by the Fabrique Nationale d'Armes de Guerre of Liege, Belgium, and employing an enclosed shaft and bevel-gear drive to the rear wheel, was the most successful of these and continued in this general form until 1923.

Anagi stove ceramic liner, Sri Lanka, 1980s Firewood is renewable in that the cycle of tree-growing, felling and burning allows replacement over about 100 years. This form of cheap stove, made from local materials, burns fuel very efficiently, with little waste of the heat and a greatly reduced smoke problem.

Many people disliked the obtrusive shape of the horn loudspeaker in their living rooms. The development of loudspeakers with shallow cones of stiff paper enabled manufacturers to produce more pleasing designs which could be attractively decorated.