An axe (æks sometimes ax in American English; see spelling differences) is an implement that has been used for millennia to shape, split, and cut wood, to harvest timber, as a weapon, and as a ceremonial or heraldic symbol. The axe has many forms and specialised uses but generally consists of an axe head with a handle, also called a haft or a helve.
Before the modern axe, the stone-age hand axe without a handle was used from 1.5 million years BP. Hafted axes (those with a handle) date only from 6,000 BC. The earliest examples of handled axes have heads of stone with some form of wooden handle attached (hafted) in a method to suit the available materials and use. Axes made of copper, bronze, iron and steel appeared as these technologies developed.
The axe is an example of a simple machine, as it is a type of wedge, or dual inclined plane. This reduces the effort needed by the wood chopper. It splits the wood into two parts by the pressure concentration at the blade. The handle of the axe also acts as a lever allowing the user to increase the force at the cutting edge—not using the full length of the handle is known as choking the axe. For fine chopping using a side axe this sometimes is a positive effect, but for felling with a double bitted axe it reduces efficiency.
Generally, cutting axes have a shallow wedge angle, whereas splitting axes have a deeper angle. Most axes are double bevelled (i.e. symmetrical about the axis of the blade), but some specialist broadaxes have a single bevel blade, and usually an offset handle that allows them to be used for finishing work without putting the user's knuckles at risk of injury. Less common today, they were once an integral part of a joiner and carpenter's tool kit, not just a tool for use in forestry. A tool of similar origin is the billhook.
Most modern axes have steel heads and wooden handles, typically hickory in the US and ash in Europe and Asia, although plastic or fibreglass handles are also common. Modern axes are specialised by use, size and form.
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En histoire de l'architecture, la stéréotomie est l'art de concevoir et fabriquer des volumes complexes en pierre et des assemblages en bois.Ce cours propose une réinterprétation de la stéréotomie
Ce cours entend exposer les fondements de la géométrie à un triple titre :
1/ de technique mathématique essentielle au processus de conception du projet,
2/ d'objet privilégié des logiciels de concept
A battle axe (also battle-axe, battle ax, or battle-ax) is an axe specifically designed for combat. Battle axes were specialized versions of utility axes. Many were suitable for use in one hand, while others were larger and were deployed two-handed. Axes designed for warfare ranged in weight from just over , and in length from just over to upwards of , as in the case of the Danish axe or the sparth axe. Cleaving weapons longer than 150 cm would arguably fall into the category of polearms.
The francisca (or francesca) was a throwing axe used as a weapon during the Early Middle Ages by the Franks, among whom it was a characteristic national weapon at the time of the Merovingians (about 500 to 750 AD). It is known to have been used during the reign of Charlemagne (768–814). Although generally associated with the Franks, it was also used by other Germanic peoples of the period, including the Anglo-Saxons; several examples have been found in England.
The sagaris (Σάγαρις and Σάγαρι) is an ancient shafted weapon used by the horse-riding ancient Saka and Scythian peoples of the great Eurasian steppe. It was used also by Western and Central Asian peoples: the Medes, Persians, Parthians, Indo-Saka, Kushans, Mossynoeci, and others living within the milieu of Iranian peoples. According to Aristarchus of Samothrace, the legendary Amazons used the sagaris, as well. In The Histories, Herodotus attributes the sagaris to the Sacae Scythians in the army-list of Xerxes the Great.
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PERGAMON-ELSEVIER SCIENCE LTD2020
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In this paper, we attempt to show some consequences of bringing the body back into higher education, through the use of performing arts in the curricular context of scientific programs. We start by arguing that dominant traditions in higher education repro ...