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
Drum stick still in significant numbers, of oak. Drumsticks of the traditional form are also made from metal, carbon fibre and other modern materials. The tip or bead is the part most often used to strike the instrument. Originally and still commonly of the same piece of wood as the rest of the stick, sticks with nylon tips have also been available since 1958, originally conceived by Jonathan Humphrey and Joe Calato in Niagara Falls, NY. In the 1970s, an acetal tip was introduced, designed by Ken Drinan and Paul Kiersted. Tips of whatever material are of various shapes, including acorn, barrel,