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
Wok food in the wok is frequently turned with a tossing motion of the arm and wrist when stir-frying food. The classic stick handle is made of hollow hammered steel, but other materials may be used, including wood or plastic-covered hand grips. Because of their popularity in northern China, stick-handled woks are often referred to as "pao woks" or "Peking pans". Stick handles are normally not found on cast iron woks since the wok is either too heavy for the handle or the metal is too thin to handle the tensile stress exerted by the handle. Larger-diameter woks with stick-type handles