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
Cyr wheel Cyr wheel The Cyr wheel (also known as the roue Cyr, mono wheel, or simple wheel) is an acrobatic apparatus that consists of a single large ring made of aluminum or steel with a diameter approximately taller than the performer. The performer stands inside the Cyr wheel and grasps its rim, causing it to roll and spin gyroscopically while performing acrobatic moves in and around the rotating wheel. The apparatus and its movement vocabulary have some similarities with the German wheel, but whereas the German wheel consists of two large rings linked together by horizontal crossbars and has handles for