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Archive for November 9th, 2007

Leonardo’s Tank

Posted by critcalmass on November 9, 2007

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Leonardo was to say, in his introductory letter to Ludovico Sforza, Duke of Milan, that, “I can make armoured cars, safe and unassailable, which will enter the serried ranks of the enemy with their artillery, and there is no company of men at arms so great that they will break it. And behind these the infantry will be able to follow quite unharmed and without any opposition.”

 

It had radial outward facing blunderbuss guns - for attack. The top section could be separated from the other (presumably for vision).

 

The wheels were very thin - arguably too thin without any tracks to have been useful. Also in Leonardo’s drawings, it appears that the crank would be turning the wheels against each other - in opposition.

 

But despite this - he was still many years ahead of the competition. And looking at these sketches, and knowing Leonardo - there may have been more up his sleeve than we will ever know.

 

It was made of wood, and would have been extremely difficult to move - making it an easy target for hurled or machine launched weapons and artillery. Had it been made of metal - it would have offered better protection - but been completely impossible to move. It could be powered either through the use of horse, or by men hand cranking. The cranks were attached to trundle wheels, which then attached onto the driving wheels. It was considered that the second method of powering the vehicle was preferable as horses might be difficult to keep calm within the small confines of what would be a noisy area. Had steam engines been usable for locomotion in his time, Leonardo’s tank would have been a winner. The basic principle was at least sound.

 

His turtle-shaped design had a major flaw in that the front and rear wheels were geared to turn in opposite directions. Suggestions have been made that this could have been a deliberate mistake by Leonardo as he was against war and peaceable by nature.

 

Leonardo was certainly not the first to work on the idea of a tank; it was quite a common area of research in his day with several sail-powered tanks being designed. Still, it was to be a further four hundred years after he died before World War 1 saw tanks go into use during wartime. None of the early designs (including Leonardo’s) ever reached the stage of being built.

LINK

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Etruscans

Posted by critcalmass on November 9, 2007

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Banquet scenes were common in the art of archaic Italy. This drawing reproduces such a scene on a terracotta frieze from the palace at Murlo. The artist shows the guests reclining on couches, as was customary in the Greek world too. A mixing bowl of the kind often found in aristocratic tombs rests on a stand between the two couches. One of the guests plays a lyre.

 

Beginning in the late eighth century, a number of communities in southern Etruria— Caere, Tarquinii, Vulci, and Veii—began to develop rapidly into city-states. By the end of the seventh century, others could be found in northern Etruria, at Populonia, Rusellae, and Volaterrae, as well as inland in the valleys of the Tiber and Arno rivers. These cities possessed a common language, and many features of their government, social organization, and religion were similar; they also had some sense of a shared identity. Yet Etruscan city-states were never united politically, and frequently they were rivals and even enemies.

 

The major centers of Etruria controlled substantial territories. Political power and public cult were concentrated at the core, reducing other settlements in the territory to a subordinate role, or forcing their abandonment when the inhabitants were moved to the city. The larger cities often spread over several hundred acres, although buildings did not occupy all of this space. Smaller dependent settlements, some as extensive as twenty-five acres (10 ha), could be found toward the fringes of a larger community’s territory, too far away for the land there to be cultivated by people from the center. Villages occupying less than about ten acres (4 ha) surrounded the central city, as did hamlets or isolated farms that covered two to three acres (1 ha) at most. In certain instances some lesser settlements contained a religious structure or elite dwelling, and even fortifications. In addition, a few towns of intermediate size, seldom exceeding one hundred acres (40 ha), preserved a precarious independence in zones that were isolated from major settlements. Most such towns, however, eventually succumbed to their stronger neighbors: Murlo was destroyed twice, first c. 600 and finally c. 530; Acquarossa was eclipsed around 500.

 

 

Shrines in the territories of some cities promoted relations both between communities in Italy and with the outside world. In the Orientalizing Period, aristocratic households may have mediated much long-distance trade, but in the sixth century a broader institutional involvement developed in some places. At Graviscae and Pyrgi, the ports of Tarquinii and Caere respectively, elaborate temple complexes received dedications from local notables as well as from Greek, Phoenician, Latin, and Etruscan merchants. In some cases, local gods were identified with foreign ones: At Graviscae, the local Turan was equated with the Greek Aphrodite, while at Pyrgi the Caeretan deity Uni was linked with the Phoenician Astarte. Around 500, in a long inscription in Etruscan and Phoenician, the ruler of Caere recorded a dedication he had made; his choice of languages illustrates the importance of Phoenicians here (coming from Carthage perhaps, or from another western colony). Thus cult places such as these served as centers of interaction between peoples of different origin under the patronage of the host community. Elsewhere in the Mediterranean at this time sanctuary sites are known to have filled the same function.

 

Traces of Etruscans are not limited to Etruria. In some places, Etruscan settlements followed Villanovan predecessors, just as they did in Etruria itself: Capua and Nola in Campania, as well as Felsina (modern Bologna), across the Apennines, are good examples. New Etruscan centers appeared elsewhere in the Po Valley in the course of the sixth and fifth centuries. Small groups of Etruscans also inhabited places that remained essentially non-Etruscan, because inscriptions in the Etruscan language have been found in many places in Latium (including Rome itself), Campania, and Umbria.

 

In the Archaic Period, Etruscan elites were among the most active in Italy, but the nature of their interaction with non-Etruscan communities is not always clear. Some scholars suggest that Etruscan practices spread with the movement of elites and their followers, who would come to dominate a preexisting community. Some of the Etruscan centers in the north may have begun in just this way: Hatria, from which the Adriatic Sea received its name, and Spina, a major trading center from the closing decades of the sixth century, may originally have been Greek cities. Roman writers of a later date thought that two of Rome’s last three kings were of Etruscan descent, and they believed that some of Rome’s core institutions and practices were of Etruscan origin. Even so, it is by no means clear how far the emergence of cities in regions such as Latium is to be credited to Etruscans. In the seventh and sixth centuries, the chief Etruscan communities were among Italy’s richest and most powerful urban centers; as such, they would plainly have had marked influence, either imposed directly through the power they exerted over their neighbors, or indirectly through the models they provided for others. The similarity in material culture that many scholars regard as signifying the undoubted presence of an Etruscan elite may rather be due to the formation of an international elite style—one that crossed ethnic boundaries, and was shared by numerous local elites imitating each other to increase their own prestige. By the same token, the presence of Etruscan speakers may indicate only that the newly forming city-states in many regions were for a time open to outsiders. The Romans, it should be noted, thought that Lucius Tarquinius Priscus—the first Etruscan king of Rome, and father of the second—came to Rome from Tarquinii as an immigrant, not as a conqueror.

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Cruiser Tank Sentinel AC1

Posted by critcalmass on November 9, 2007

 

The outbreak of war found Australia with no modern tank force and little industrial infrastructure. The AC1 Sentinel was a home-grown tank developed at lightning speed to fight off the anticipated Japanese invasion.

 

An AC3 tank.

 

In spite of the speed with which it was produced, the AC1 Sentinel was a remarkably innovative design featuring an all-cast hull and a heavy armament. This is the AC4, which mounted a 17-pdr gun.

 

In 1939 Australia’s armed forces had virtually no modern tanks and lacked almost any form of heavy engineering background to produce them; even an automobile industry was lacking. Nevertheless the Australian government realized that it was unlikely that any large amounts of heavy war matériel would be available to Australia from overseas, and so set to produce its own. Among the requirements were tanks, and as there was no local expertise on the subject one engineer was sent to the United States and an experienced engineer was obtained from the United Kingdom.

With this experience to hand the Australian army staff issued a specification and Australian industry set to with a will, The first design, known as the AC1 (Australian Cruiser 1) was to have a 2-pdr (40-mm/l.57-in) gun and two 7.7-mm (0.303-in) machine-guns, and it was decided to use as many components of the American M3 tank as possible. The power plant was to comprise three Cadillac car engines joined together and extensive use was to be made of cast armour. A second model, to be known as the AC2, was mooted, but by late 1941 as the Japanese became increasingly aggressive in the Pacific, the AC2 was passed over in favour of the existing AC1, which had armour ranging from 25 mm (1 in) to 65 mm (2.55 in) in thickness.

The first AC1s were ready by January 1942 and were soon named Sentinel. The whole project from paperwork requests to hardware had taken only 22 months, which was a remarkable achievement since all the facilities to build the tank had to be developed even as the tanks were being built. But only a few AC1 tanks were produced as by 1942 it was realized that the 2-pdr gun would be too small to have any effect against other armour and anyway, the hurried design still had some ‘bugs’ that had to be modified out of the design. Most of these bugs were only minor, for the Sentinel turned out to be a remarkably sound design capable of considerable stretch and modification. This was just as well, for the Sentinel AC3 mounted a 25-pdr (87.6-mm/3.45-in) field gun barrel in the turret to overcome the shortcomings of the 2-pdr.

The 25-pdr was chosen as it was already in production locally, but it was realized that this gun would have only limited effect against armour and the Sentinel AC4 with a 17-pdr (76.2- mm/3-in) anti-tank gun was proposed and a prototype was built. This was during mid-1943, and by then the background to the hurried introduction of the AC1 into service had receded. There was no longer the chance that the Japanese might invade the Australian mainland and anyway, M3s and M4s were pouring off the American production lines in such numbers that there would be more than enough to equip all the Allies, including Australia, Thus Sentinel production came to an abrupt halt in July 1943 in order to allow the diversion of industrial potential to more important priorities. The Sentinel series was a remarkable one, not only from the industrial side but also from the design viewpoint. The use of an all-cast hull was way ahead of design practice elsewhere, and the ready acceptance of heavy guns like the 25-pdr and the 17-pdr was also way ahead of contemporary thought. But the Sentinel series had little impact at the time for the examples produced were used for training only.

LINK

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