I hope someone can move us in the direction of electric or magnetic propulsion !

We need a mind and capability of Heron of the 200 AD era. see below:

Heron of Alexandria

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Born: about 10 in (possibly) Alexandria, Egypt
Died: about 75

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Sometimes called Hero, Heron of Alexandria was an important geometer and worker in mechanics. Perhaps the first comment worth making is how common the name Heron was around this time and it is a difficult problem in the history of mathematics to identify which references to Heron are to the mathematician described in this article and which are to others of the same name. There are additional problems of identification which we discuss below.

A major difficulty regarding Heron was to establish the date at which he lived. There were two main schools of thought on this, one believing that he lived around 150 BC and the second believing that he lived around 250 AD. The first of these was based mainly on the fact that Heron does not quote from any work later than Archimedes. The second was based on an argument which purported to show that he lived later that Ptolemy, and, since Pappus refers to Heron, before Pappus.

Both of these arguments have been shown to be wrong. There was a third date proposed which was based on the belief that Heron was a contemporary of Columella. Columella was a Roman soldier and farmer who wrote extensively on agriculture and similar subjects, hoping to foster in people a love for farming and a liking for the simple life. Columella, in a text written in about 62 AD [5]:-

... gave measurements of plane figures which agree with the formulas used by Heron, notably those for the equilateral triangle, the regular hexagon (in this case not only the formula but the actual figures agree with Heron's) and the segment of a circle which is less than a semicircle ...

However, most historians believed that both Columella and Heron were using an earlier source and claimed that the similarity did not prove any dependence. We now know that those who believed that Heron lived around the time of Columella were in fact correct, for Neugebauer in 1938 discovered that Heron referred to a recent eclipse in one of his works which, from the information given by Heron, he was able to identify with one which took place in Alexandria at 23.00 hours on 13 March 62.

From Heron's writings it is reasonable to deduce that he taught at the Museum in Alexandria. His works look like lecture notes from courses he must have given there on mathematics, physics, pneumatics, and mechanics. Some are clearly textbooks while others are perhaps drafts of lecture notes not yet worked into final form for a student textbook.

Pappus describes the contribution of Heron in Book VIII of his Mathematical Collection. Pappus writes (see for example [8]):-

The mechanicians of Heron's school say that mechanics can be divided into a theoretical and a manual part; the theoretical part is composed of geometry, arithmetic, astronomy and physics, the manual of work in metals, architecture, carpentering and painting and anything involving skill with the hands.

... the ancients also describe as mechanicians the wonder-workers, of whom some work by means of pneumatics, as Heron in his Pneumatica, some by using strings and ropes, thinking to imitate the movements of living things, as Heron in his Automata and Balancings, ... or by using water to tell the time, as Heron in his Hydria, which appears to have affinities with the science of sundials.

A large number of works by Heron have survived, although the authorship of some is disputed. We will discuss some of the disagreements in our list of Heron's works below. The works fall into several categories, technical works, mechanical works and mathematical works. The surviving works are:

On the dioptra dealing with theodolites and surveying. It contains a chapter on astronomy giving a method to find the distance between Alexandria and Rome using the difference between local times at which an eclipse of the moon is observed at each cities. The fact that Ptolemy does not appear to have known of this method led historians to mistakenly believe Heron lived after Ptolemy;

The pneumatica in two books studying mechanical devices worked by air, steam or water pressure. It is described in more detail below;

The automaton theatre describing a puppet theatre worked by strings, drums and weights;

Belopoeica describing how to construct engines of war. It has some similarities with work by Philon and also work by Vitruvius who was a Roman architect and engineer who lived in the 1st century BC;

The cheirobalistra about catapults is thought to be part of a dictionary of catapults but was almost certainly not written by Heron;

Mechanica in three books written for architects and described in more detail below;

Metrica which gives methods of measurement. We give more details below;
Definitiones contains 133 definitions of geometrical terms beginning with points, lines etc. In [15] Knorr argues convincingly that this work is in fact due to Diophantus;

Geometria seems to be a different version of the first chapter of the Metrica based entirely on examples. Although based on Heron's work it is not thought to be written by him;

Stereometrica measures three-dimensional objects and is at least in part based on the second chapter of the Metrica again based on examples. Again it is though to be based on Heron's work but greatly changed by many later editors;

Mensurae measures a whole variety of different objects and is connected with parts of Stereometrica and Metrica although it must be mainly the work of a later author;

Catoprica deals with mirrors and is attributed by some historians to Ptolemy although most now seem to believe that this is a genuine work of Heron. In this work, Heron states that vision results from light rays emitted by the eyes. He believes that these rays travel with infinite velocity.

Let us examine some of Heron's work in a little more depth. Book I of his treatise Metrica deals with areas of triangles, quadrilaterals, regular polygons of between 3 and 12 sides, surfaces of cones, cylinders, prisms, pyramids, spheres etc. A method, known to the Babylonians 2000 years before, is also given for approximating the square root of a number. Heron gives this in the following form (see for example [5]):-

Since 720 has not its side rational, we can obtain its side within a very small difference as follows. Since the next succeeding square number is 729, which has 27 for its side, divide 720 by 27. This gives 26 2/3. Add 27 to this, making 53 2/3, and take half this or 26 5/6. The side of 720 will therefore be very nearly 26 5/6. In fact, if we multiply 26 5/6 by itself, the product is 720 1/36, so the difference in the square is 1/36. If we desire to make the difference smaller still than 1/36, we shall take 720 1/36 instead of 729 (or rather we should take 26 5/6 instead of 27), and by proceeding in the same way we shall find the resulting difference much less than 1/36.

Heron also proves his famous formula in Book I of the Metrica :

if A is the area of a triangle with sides a, b and c and s = (a + b + c)/2 then
A2 = s (s - a)(s - b)(s - c).

In Book II of Metrica, Heron considers the measurement of volumes of various three dimensional figures such as spheres, cylinders, cones, prisms, pyramids etc. His preface is interesting, partly because knowledge of the work of Archimedes does not seem to be as widely known as one might expect (see for example [5]):-

After the measurement of surfaces, rectilinear or not, it is proper to proceed to solid bodies, the surfaces of which we have already measured in the preceding book, surfaces plane and spherical, conical and cylindrical, and irregular surfaces as well. The methods of dealing with these solids are, in view of their surprising character, referred to Archimedes by certain writers who give the traditional account of their origin. But whether they belong to Archimedes or another, it is necessary to give a sketch of these results as well.

Book III of Metrica deals with dividing areas and volumes according to a given ratio. This was a problem which Euclid investigated in his work On divisions of figures and Heron's Book III has a lot in common with the work of Euclid. Also in Book III, Heron gives a method to find the cube root of a number. In particular Heron finds the cube root of 100 and the authors of [9] give a general formula for the cube root of N which Heron seems to have used in his calculation:

a + b d/(b d + aD)(b - a),
where a3 < N < b3, d = N - a3, D = b3 - N.

In [9] it is remarked that this is a very accurate formula, but, unless a Byzantine copyist is to be blamed for an error, they conclude that Heron might have borrowed this accurate formula without understanding how to use it in general.

The Pneumatica is a strange work which is written in two book, the first with 43 chapters and the second with 37 chapters. Heron begins with a theoretical consideration of pressure in fluids. Some of this theory is right but, not surprisingly, some is quite wrong. Then there follows a description of a whole collection of what might best be described as mechanical toys for children [1]:-

Trick jars that give out wine or water separately or in constant proportions, singing birds and sounding trumpets, puppets that move when a fire is lit on an altar, animals that drink when they are offered water ...

Although all this seems very trivial for a scientist to be involved with, it would appear that Heron is using these toys as a vehicle for teaching physics to his students. It seems to be an attempt to make scientific theories relevant to everyday items that students of the time would be familiar with.

There is, rather remarkably, descriptions of over 100 machines such as a fire engine, a wind organ, a coin-operated machine, and a steam-powered engine called an aeolipile. Heron's aeolipile, which has much in common with a jet engine, is described in [2] as follows:-

The aeolipile was a hollow sphere mounted so that it could turn on a pair of hollow tubes that provided steam to the sphere from a cauldron. The steam escaped from the sphere from one or more bent tubes projecting from its equator, causing the sphere to revolve. The aeolipile is the first known device to transform steam into rotary motion.

Heron wrote a number of important treatises on mechanics. They give methods of lifting heavy weights and describe simple mechanical machines. In particular the Mechanica is based quite closely on ideas due to Archimedes. Book I examines how to construct three dimensional shapes in a given proportion to a given shape. It also examines the theory of motion, certain statics problems, and the theory of the balance.

In Book II Heron discusses lifting heavy objects with a lever, a pulley, a wedge, or a screw. There is a discussion on centres of gravity of plane figures. Book III examines methods of transporting objects by such means as sledges, the use of cranes, and looks at wine presses.

Other works have been attributed to Heron, and for some of these we have fragments, for others there are only references. The works for which fragments survive include one on Water clocks in four books, and Commentary on Euclid's Elements which must have covered at least the first eight books of the Elements. Works by Heron which are referred to, but no trace survives, include Camarica or On vaultings which is mentioned by Eutocius and Zygia or On balancing mentioned by Pappus. Also in the Fihrist, a tenth century survey of Islamic culture, a work by Heron on how to use an astrolabe is mentioned.

Finally it is interesting to look at the opinions that various writers have expressed as to the quality and importance of Heron. Neugebauer writes [7]:-

The decipherment of the mathematical cuneiform texts made it clear that much of the "Heronic" type of Greek mathematics is simply the last phase of the Babylonian mathematical tradition which extends over 1800 years.

Some have considered Heron to be an ignorant artisan who copied the contents of his books without understanding what he wrote. This in particular has been levelled against the Pneumatica but Drachmann, writing in [1], says:-

... to me the free flowing, rather discursive style suggests a man well versed in his subject who is giving a quick summary to an audience that knows, or who might be expected to know, a good deal about it.

Some scholars have approved of Heron's practical skills as a surveyor but claimed that his knowledge of science was negligible. However, Mahony writes in [1]:-

In the light of recent scholarship, he now appears as a well-educated and often ingenious applied mathematician, as well as a vital link in a continuous tradition of practical mathematics from the Babylonians, through the Arabs, to Renaissance Europe.

Finally Heath writes in [5]:-

The practical utility of Heron's manuals being so great, it was natural that they should have great vogue, and equally natural that the most popular of them at any rate should be re-edited, altered and added to by later writers; this was inevitable with books which, like the "Elements" of Euclid, were in regular use in Greek, Byzantine, Roman, and Arabian education for centuries.




Article by: J J O'Connor and E F Robertson

April 1999


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MacTutor History of Mathematics
[http://www-history.mcs.st-andrews.ac...es/Heron.html]

Check out Heron's inventions. Extrodinary !

So its only whithin the last couple of years that there has happened something in the development of batteries, due to improvements on cell phone and laptop computer batteries? Think I read somewhere on Teslas homesite that their car drives on ordinary laptop batteries, which I guess must be a lot cheaper than the ordinary massive heavy duty batteries normally used in eletric cars.

It seems now that 3 out of the 5 big problems with electric cars has been solved. The high weight and high cost of the batteries, as well as the speed performance. Now theres only the charging time and the driving range left, although they have been significantly improved - from 8 - 10 hours down to 3,5 hours, and from 100 km up to 350 - 400 km. Its still not a car you can use for vacations down to Italy, but if the charging time could be reduced to 1/2 hour, then you can stop for a cup of coffee every 350 km which most people do anyway.

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It all comes down to this on election day: Are you a racist, or do you look down on spastics?

While in the doctors office yesterday the fellow (from the Mfgr.) who tests ny wife's " Pacemaker " said they had developed a battery containing a spec of plutonium that would allow the device to last a life time but were prohibited from using that material by the Govrnment. Currently every 7 or so years they must be surgically removed and recharged or replaced.

I think the Tesla car is a move in the right direction. So is the implosion motor. People like Tesla, Keely, Pond, and Cayce discovered amazing things.

Electromagnetic propulsion may very well enable us to travel through space, as soon as we discover how to "ride" the "roads" of magnetic lines that flow from planet to planet. Polarity is an amazing thing.

Some day the rose will blossom more openly from its cross.

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www.richard-t-osborne.com
www.lonewolfsurvivalist.com

solution to our pollution ills and energy concerns!!!!

At the Geneva Motor Show the Norwegian Company "Think Global" presented their first Model "TH!NK City".
It's the first electrical Car powered by Li-Ion Batteries. And production is set to begin with an output of 10.000 cars / year.

It's a small city car with a range of up to 180km at a top speed of 100 kph.
It comes at a cost of 20.000 Euro.




A bigger version with space for 5 people and an extended range of up to 450km and a topspeed of 130 kph is in the making.

Finally some movement

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At least Th!nk looks better than the danish electric car! Still, 20.000€ is way too expensive for a car in that size, and twice the price of a simular sized gasoline car.

Does it use the same kinda batteries as the Tesla Roadster? If so, then why arent the range and top speed higher?

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It all comes down to this on election day: Are you a racist, or do you look down on spastics?

Well, I suppose because this is build as a normal car while the Tesla roadster is a low weight sport/fun car... This has airbags, ABS,.... batteries aren't everything

I would guess that the price isn't that low yet, because it is not in massproduction... elements like the batteries are quite new technology...
But if you are a commuter travelling about 20-40km every day, most of it in a city area... then you sure feel the benefits of the car quite soon I guess.

And just twice the price for a revolutionary design is not so terrible I think...

Anyways, it will be a few years untill the common people can get their hands on these... production begins this summer and the the first customers will be companies in scandinavia and switzerland... The "Th!nk Ox" (5 seated car) might be a great taxi in a few years... and hopefully then the batteries will increase the range even more

Thinks go faster suddenly That's the most important news... and I suppose Ford will kick themselves for cancling and selling the Th!nk project in 2003

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I read that th!nk is going to be produced with the same type of laptop batteries (from the same Californian company) as the Tesla roadster. The decreased top speed and range must be as a result of fewer laptop batteries, no?

Anyway, 100% electric cars are particulary interesting in Denmark since they are taxfree, where ordinary cars costs 2-3 times more than in other countries. I read that the danish hydrogen company H2 Logic has won a contract of providing their hydrogen technoligy to the Th!nk cars in combination with its batteries, which will increase its range to 300 km.

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It all comes down to this on election day: Are you a racist, or do you look down on spastics?

Or go nuke!!!

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"Chaplain Charlie will tell you about how the free world will conquer Communism with the aid of God and a few marines! God has a hard-on for marines because we kill everything we see! He plays His games, we play ours! To show our appreciation for so much power, we keep heaven packed with fresh souls! God was here before the Marine Corps! So you can give your heart to Jesus, but your ass belongs to the Corps! Do you ladies understand?"

Ford Nucleon - Wikipedia, the free encyclopedia
And you thought it was a joke............

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“ The subjects of every state ought to contribute towards the support of the government, as nearly as possible, in proportion to their respective abilities; that is, in proportion to the revenue which they respectively enjoy under the protection of the state.”

Adam Smith , The Wealth of Nations 1776

"We have always known that heedless self-interest was bad morals; we know now that it is bad economics"
FDR's second Inaugural Address

Speaking of hydrogen cars, this is an interesting motherfucker. Its the first of its kind to be produced in a larger scale, and sold to regular costumers. First 1000 of them are only to be leased out to selected people in the LA area, where there are numerous hydrogen stations already.

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It all comes down to this on election day: Are you a racist, or do you look down on spastics?

hurry up, oil is going close to 110$ and soon to 150$! :/

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This might be the best thing that ever happened!

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It all comes down to this on election day: Are you a racist, or do you look down on spastics?

yes and no

people who uses their car everyday and who have little revenues (basicaly in the country side where there is no public transporation or little) they are the one who are paying the price...

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