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Bone is also made of both mineral and carbon-based materials; the mineral-based are calcium, phosphorus, and fluoride; the carbon-based is the protein ossein. Bone also includes the mineral hydroxyapatite, "A calcium phosphate mineral which forms a hard outer covering over the collagen and protein matrix," [1] or organic material.
The Anglo-Saxon Franks Casket is a whale bone casket imitating earlier ivory ones. [4] Medieval bone caskets were made by the Embriachi workshop of north Italy (c. 1375 –1425) and others, mostly using rows of thin plaques carved in relief. [5] A face carved on a piece of curved bone. The face is framed by hair and part of a winged head-dress ...
Bone ash is a white material produced by the calcination of bones. Typical bone ash consists of about 55.82% calcium oxide , 42.39% phosphorus pentoxide , and 1.79% water . [ 1 ] The exact composition of these compounds varies depending upon the type of bones being used, but generally the formula for bone ash is Ca 5 (OH)(PO 4 ) 3 .
Bone awls tend to be classified according to the characteristics of the bone used to make the awl. Many bone awls retain an epiphysis, or rounded end of a bone. Although authors have differing theories as to the uses of bone awls, the two main uses agreed upon are as manipulators in the making of basketry and as perforators in the working of ...
Lamellar armour is a type of body armour made from small rectangular plates (scales or lamellae) of iron, steel, leather , bone, or bronze laced into horizontal rows. Lamellar armour was used over a wide range of time periods in Central Asia , Eastern Asia (especially in China , Japan , Korea , Mongolia , and Tibet ), Western Asia , and Eastern ...
Bone strikers are often unsuitable for carving, in fact bone is more of a carved raw material than rocks. Professor Tixier experimenting with a soft hammer. During the percussion itself, which lasts thousandths of a second, the soft hammer, being a non-isotropic linear elastic, varies its tension state and increases its internal energy in the ...
In 1869 W.A. Seaver wrote: "In times more modern (1613), some masons digging near the ruins of a castle in Dauphiné, in a field which by tradition had long been called 'The Giant's Field,' at a depth of 18 feet discovered a brick tomb 30 feet long, 12 feet wide, and 8 feet high, on which was a gray stone with the words 'Theutobochus Rex' cut thereon.
The spears are among the oldest hunting weapons discovered and were found together with animal bones and stone and bone tools. Being used by the oldest known group of hunters, they provided unique proof that early human ancestors were much closer to modern humans in both complex social structure and technical ability than thought before.