Wood the growth of the young timber in open stands after the old trees have been removed is more rapid than in trees in a closed forest, and in the manufacture of articles where strength is an important consideration such "second-growth" hardwood material is preferred. This is particularly the case in the choice of hickory for handles and spokes. Here not only strength, but toughness and resilience are important. The results of a series of tests on hickory by the U.S. Forest Service show that: The effect of rate of growth on the qualities of chestnut wood is summarized by the
Wartenberg wheel toy, sometimes while connected to a violet wand electrical device. Clothing pattern-making can use a version of the Wartenberg wheel, called a pounce wheel, to transfer markings from fabric to paper. Pounce wheels resemble standard Wartenberg wheels in shape but have wooden handles. Wartenberg wheel A Wartenberg wheel, also called a Wartenberg pinwheel or Wartenberg neurowheel, is a medical device for neurological use. Robert Wartenberg (1887–1956) designed the wheel to test nerve reactions (sensitivity) as it rolled systematically across the skin. A Wartenberg wheel is generally made of stainless steel with a handle of approximately in length. The wheel, which