Diospyros ebenum (Ebony) : 無料・フリー素材/写真
Diospyros ebenum (Ebony) / wallygrom
| ライセンス | クリエイティブ・コモンズ 表示-継承 2.1 |
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| 説明 | Peradeniya Botanical Gardens near Kandy, Sri Lanka.Diospyros is a genus of over 700 species of deciduous and evergreen trees and shrubs. The majority are native to the tropics, with only a few species extending into temperate regions. Individual species valued for their hard, heavy, dark timber, are commonly known as ebony trees, while others are valued for their fruit and known as persimmon trees. Some are useful as ornamentals and many are of local ecological importance. Species of this genus are generally dioecious, with separate male and female plants.Ceylon ebony or Diospyros ebenum (Sinhala: කළුවර Kaluwara) (Tamil: கருங்காலி Karungaali), produces the valuable black wood known as ebony.The tree occurs in southern India, Sri Lanka and Indonesia.The sap wood of Diospyros ebenum is light-yellowish gray, with a glossy-black core occasionally containing light fibers. The wood also has metallic gloss with fine, smooth texture whose grains can be straight, a bit chaotically organized and wavy.In Sri Lanka, it is illegal to harvest and sell ebony wood. It possesses the following valuable qualities: high wood hardness (twice as hard as oak), easy to polish (suitable for high-quality polishing, after which it becomes perfectly smooth), it has practically no pitting, provides glossy smooth surface, water and termite-resistant. The tree's wood density is extremely high (up to 1,200 kg/m3 (2,000 lb/cu yd)), making it sink in water. It is also hard to treat both manually and mechanically. The wood itself is short grain, subject to cracking.The polished wood is cold to the touch, and its heat emissions are so high that it causes melting of metal vessels in which the wood is burnt.In the 16th—19th centuries, the best furniture was made of Ceylon ebony. The wood was preferred for making door and window handles, tableware shanks, while the cuttings were used for knitting needles and hooks or razor handles.[citation needed] Today, the wood is commonly used in decorative wooden inlays, handmade artwork, and for parts of musical instruments that tend to receive the most wear: piano keys, fingerboards and necks for fretted and bowed instruments, pegs, tailpieces, and nuts. It's also commonly used in turnery to make knife handles, brush holders, and chopsticks. It is also used to treat eye infections in Unani medicine.The high demand of Ceylon ebony wood has threatened this species with extinction. In 1994, the World Conservation Union, currently known as IUCN, included Ceylon ebony tree into the Red Book. However, as of 1998, IUCN has insufficient data about this species. Both India and Sri Lanka have laws prohibiting international trade of the wood. |
| 撮影日 | 2017-01-15 13:14:29 |
| 撮影者 | wallygrom |
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| カメラ | Canon PowerShot SX410 IS , Canon |
| 露出 | 0.04 sec (1/25) |
| 開放F値 | f/3.5 |
| 焦点距離 | 21201.64615 dpi |