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Western europe

There was a late Copper Age in Spain with techniques coming across southern Europe from the Caucasus, after 3,000 B.C. A source of tin was found in northwest Spain so that the area could readily participate in the bronze industries between 2,500 and 1,500 B.C. Some of the metal-using communities, such as those in southern Spain and Portugal about 2,500 had to be fortified and some had two high walls with outlying fortresses to give warning of attack. Defenders fought with bow and arrows. (Ref. 175 )

In the last chapter we discussed the 4th millennium inhabitants of England, the Windmill Hill people. It was probably these who, at the beginning of the 3rd millennium, started to build a series of remarkable stone monuments in southern England. The best known and most thoroughly investigated, written about, photographed, painted and romanticized of these, is Stonehenge. The original structure, Stonehenge 1, dates to not later than 2,900 when there were already some 180 separate habitation centers in Wessex. At Stonehenge, first of all there was dug a circular ditch some 1,050 feet in circumference, 4 1/2 to 6 feet deep and 12 feet wide. The purpose of this was to supply the chalk soil for a bank which was thus built up along the inner side of the ditch. It has been estimated that this alone required about 28,000 man-hours of work, using red-deer antlers for picks and whatever for shovels. The bank measures 320 feet in diameter and was at least 6 feet high, although some say 20 feet, with a causeway entrance on the northeast. Only a few stones were used in Stage I, a couple at the causeway entrance and perhaps the four Station Stones, but a mysterious feature was a group of 53 post holes also in the causeway entrance.

Most modern scholars are convinced that these were used for precise and constant observation of the extreme northerly risings of the moon for a hundred years or more. It requires nineteen years for the moon to exactly repeat its course in relation to the earth and sun, so that predictions of moon positions, possible eclipses, etc. require long periods of observation. The average diameter of the post holes is 3 feet 6 inches, with a depth of 2 1/2 feet.

There is no evidence that they ever held stones or wooden posts. Some have yielded cremation remains, flakes of flint, cups, etc. all adding to the mystery. Professor Fred Hoyle (Ref. 99 ) believes that this was not built by local people, but by some who came especially to place the circle at the exact spot needed for some astronomical reasons.

After Phase I of Stonehenge was completed (but before Phase II) another enormous, strange construction appeared about one-half mile north of Stonehenge. This is a narrow horse-shoe shaped earthworks with each leg running for one and three-quarters miles, and which is called the "Cursus", because some have felt it represents a Neolithic race-track. There is some evidence that the bluestones which we shall see were used in Stonehenge II had earlier either been used for some purpose or stock-piled at the western end of this Cursus. There are about twenty similar constructions in Britain and this one is the second longest and it may even pre-date Stonehenge I. The longest Cursus is at Dorset and measures 6.2 miles in length. (Ref. 7 ) There are none of these constructions outside Britain.

Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
NANO
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, A comprehensive outline of world history. OpenStax CNX. Nov 30, 2009 Download for free at http://cnx.org/content/col10595/1.3
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