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The shaft ranges from 120 cm to 240 cm (47.2 inches to 94.5 inches) in length and is oval shaped. The area of the shaft where the tang sits is the tachiuchi or tachiuke . The tachiuchi/tachiuke would be reinforced with metal rings ( naginata dogane or semegane ), and/or metal sleeves ( sakawa ) and wrapped with cord ( san-dan maki ).
US patents for steel ski poles began in 1933 when John B. Dickson invented a new design calling for the use of steel as the shaft material. [8] This construction was superseded by Edward L. Scott, who is credited with popularizing the lightweight aluminum ski pole in 1959, deriving his modern design from golf club shafts.
Bamboo, like wood, is a natural composite material with a high strength-to-weight ratio useful for structures. [19] Bamboo's strength-to-weight ratio is similar to timber, and its strength is generally similar to a strong softwood or hardwood timber. [20] [21] Some bamboo species have displayed remarkable strength under test conditions.
Phyllostachys bambusoides is a "running" (monopodial type) evergreen bamboo [1] which can reach a height of roughly 20 m (66 ft) and a diameter of 10 cm (3.9 in). The culms are dark green, with a thin wall that thickens with maturity, and very straight, with long internodes and two distinctive rings at the node. [2]
Phyllostachys nigra, commonly known as black bamboo [2] or purple bamboo (Chinese: 紫竹), is a species of bamboo, native to Hunan Province of China, and is widely cultivated elsewhere. [ 3 ] Growing up to 25 m (82 ft) tall by 30 cm (1 ft) broad, it forms clumps of slender arching canes which turn black after two or three seasons.
The joints of the shaft help with the balance. After harvesting, bamboo continues to change in size and shape so it must rest for 2 + 1 ⁄ 2 to 3 years after cutting before it can be used. When it has aged the proper time the bamboo should provide a good tight grip around the tang of the yanone.
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Phyllostachys aurea is a species of bamboo, and is of the 'running bamboo' type, belonging to the diverse Bambuseae tribe. It is native to Fujian and Zhejiang in China . It is commonly known by the names fishpole bamboo , golden bamboo , monk's belly bamboo , and fairyland bamboo (Australia).