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Obsidian hydration dating (OHD) is a geochemical method of determining age in either absolute or relative terms of an artifact made of obsidian.. Obsidian is a volcanic glass that was used by prehistoric people as a raw material in the manufacture of stone tools such as projectile points, knives, or other cutting tools through knapping, or breaking off pieces in a controlled manner, such as ...
Late medieval gothic plate armour with list of elements. The slot in the helmet is called an occularium. This list identifies various pieces of body armour worn from the medieval to early modern period in the Western world, mostly plate but some mail armour, arranged by the part of body that is protected and roughly by date.
Simple munition-quality [6] chest armours and helmets were mass-produced. In 1543, the Portuguese brought matchlock firearms ( tanegashima ) to Japan. [ 7 ] As Japanese swordsmiths began mass-producing matchlock firearms and firearms became used in war, the use of Lamellar armour ( ō-yoroi and dō-maru ), previously used as samurai armour ...
A pair of Small Arms Protective Insert plates, circa April 2006. These were issued to US Army units, before being replaced by the ESAPI. A ballistic plate, also known as an armour plate, is a protective armoured plate inserted into a carrier or bulletproof vest, that can be used stand-alone, or in conjunction with other armour.
According to the biblical Book of Exodus, a "breastplate" or "breastpiece" was among the clothes of the Jewish High Priest.It was a folded-over cloth garment embedded with 12 different gemstones, each inscribed with the name of a tribe of Israel.
Most recently, in 2024, researchers from the University of Thessaly, led by professor Andreas Flouris, using Wardle's 1980s replica, added new conclusions on the ergonomics and kinematics of the warrior wearing the armor, showing that "[a] group of special armed-forces personnel wearing a replica of the Dendra armour were able to complete an 11 ...
The MIL-12560K standard actually specifies four classes of hardnesses. The softest class I rates as 260-310. The toughest Class 4 rates as 420-470. [3] (K is the revision number of the standard.) MIL-DTL-46177 is an older, now-replaced standard for a high hardness steel RHA. [4]
Obsidian projectile point.. Obsidian is a naturally formed volcanic glass that was an important part of the material culture of Pre-Columbian Mesoamerica.Obsidian was a highly integrated part of daily and ritual life, and its widespread and varied use may be a significant contributor to Mesoamerica's lack of metallurgy.