Do You See Differences Or Similarities ?
- Thread starter Astroboy
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Nam Jap,
That is a good idea. As in an open forum chat. It will take off.
BTW the pictures to compare. Once I read the title thread then I started automatically looking for similarities -- because the thread title implied it. But actually to be honest I saw the differences instantly and then looked for similarites and said, Oh Yes!
hah!
That is a good idea. As in an open forum chat. It will take off.
BTW the pictures to compare. Once I read the title thread then I started automatically looking for similarities -- because the thread title implied it. But actually to be honest I saw the differences instantly and then looked for similarites and said, Oh Yes!
hah!
I believe this thread will eventually become very popular as they are no fixed rules other than the Forum Rules.
So everyone join in and make it a popular place to share pics and ideas.
Here two kinds of offices are put there, all similarities in the office but no similarities as they are run. Environments are totally different. Remember, the strict one, no jumping, the liberal, jumping is possible possible. Sometime similarities define each others. Strictly my views. Is there possibility of being right?
- Jul 14, 2007
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While we are at it, water wheels have always facinated me till the present day. Which was the first civilisation which used water wheels ?
Here's a 3D of how a water wheel operates but modus operandi isn't clearto me.
Can someone fill me on this ?
While we are at it, water wheels have always facinated me till the present day. Which was the first civilisation which used water wheels ?
Here's a 3D of how a water wheel operates but modus operandi isn't clearto me.
Can someone fill me on this ?
Lets see if we can go back and brushup on some of our physics
The undershot water wheel is easy to explain once you get a grasp of the overshot water wheel.
Here I will explain the overshot water wheel (the first cartoon picture on the left) …
Water likes to travel from a high-energy state to a low-energy state. Which is why water runs down hill.
At the top, the water has potential energy (PE) and kinetic energy (KE) (Motional energy). The traditional mechanical formula for the water at this stage would be E(total)= PE (water) + KE (water)
Expanded:
E = mg (delta-h) + ½ mv^2
Where m is the mass of the water component
G is the gravitational constant 9.8m/s^2
Delta-h is the height at which the water is initially elevated (from the ground)
V= velocity of the water component
E= energy which is measured in Joules
1 joule= 1 N*m = 1 Kg * m^2/s^2
Because energy is conserved in a closed system…the water traveling from a higher height to a lower height has the capacity to perform Work.
as it falls onto the wheel a force is applied tangential to one side of the wheel. And from traditional Newtonian mechanics we know that an unbalanced force will cause acceleration and motion
From an energy standpoint:
The Potential energy of the water is converted into kinetic energy (KE) as soon as it starts to fall. As soon as the water touches the wheel, the wheel starts to receive this energy and expresses it as motion.
Total energy of the system now is = Energy (water) + Energy (wheel)
In an ideal system (disregarding frictional forces)
PE (water initial) + KE (water initial) = PE (water final) + KE (water final) + KE (wheel)
(at any given point in space and time)
E (water) gives its energy to E (wheel) as it falls. Potential energy of the water is converted into kinetic energy (motion)… (and in case of a wheel that translates to rotation as the falling water acts like a hand rotating a wheel…similar to how handicapped people move around on a wheelchair…applying a certain degree of force tangential to circumference of a wheel….the wheel spins)
note: the water has lost energy as it travels from its height to the ground…the wheel takes that energy and uses it as motion (which is translated into work= N*meter displacement)
as for the first civilization to use the water wheel…I would say Assyrians, Egyptians or Babylonians, maybe even some early indus civilizations as long as they were close to and overly dependant on river systems…would have used some sort of water wheel
- Feb 14, 2006
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1. Hindu Omkar 2. Buddhist Omkar 3. Sikh Ek Onkar 4. Jain Omkar
LOL Which one? There are 3 correct answers. But not Assyrians, Egyptians or Babylonians. :ice:
who really knows conclusively where and when the water wheel was first utilized? i dont
but my guesses where these places
the greeks and romans definately utilized water wheels (they were a smart bunch)
but who knows if they actually developed it themselves or borrowed the technology from elsewhere
but the babylonians had a wonder called 'the hanging gardens of babylon' which were said to have been watered by a waterwheel or a chain pump (very similiar to a water wheel):
http://www.unmuseum.org/hangg.htm
http://en.wikipedia.org/wiki/Chain_pump#Chain_pumps_in_the_Middle_East_and_Rome
don't know about the credibility of such a site but it may just be true.
the water wheel is definitely a derivative of a chain pump...and the waterwheel itself is a much less complicated system than a chain pump.
so if they had chain pumps they had waterwheels. (a chain pump system is just the reverse of a waterwheel system)
Last edited:
- Jun 7, 2006
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chinese?
they are quite smart
they are quite smart
- Jun 7, 2006
- 1,323
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let's go by the logic of greatest dependence on water and i think we have to consider floods etc too..
so my guess would be egyptians, chinese and indus
so my guess would be egyptians, chinese and indus
my guesses are still babylon, egypt, indus (maybe assyrians)
later to be perfected by chinese and grecko-romans
http://en.wikipedia.org/wiki/Chain_pump#Chain_pumps_in_the_Middle_East_and_Romehttp://en.wikipedia.org/wiki/Chain_p..._East_and_Rome
sticking by the chain pump argument
later to be perfected by chinese and grecko-romans
http://en.wikipedia.org/wiki/Chain_pump#Chain_pumps_in_the_Middle_East_and_Romehttp://en.wikipedia.org/wiki/Chain_p..._East_and_Rome
sticking by the chain pump argument
- Jul 14, 2007
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Underwater Cities, Ruins and Other Urban Archeology: 7 Submerged Wonders of the World
Written by Urbanist on September 12th, 2007 - Topics: 7 Wonders, Architecture, Urban, Urban Images, Various
A wealth of human history lies submerged in ancient cities at the bottoms of lakes, seas and oceans of the world. Some of these were sent into the water via earthquakes, tsunamis or other disasters thousands of years ago. Many have just recently been rediscovered, by accident or through emergent technological innovations. Some have even caused scientists to question the history of human civilization.
Alexandria, Egypt: Off the shores of Alexandria, the city of Alexander the Great, lie what are believed to be the ruins of the royal quarters of Cleopatra. It is believed that earthquakes over 1,500 years ago were responsible for casting this into the sea, along with artifacts, statues and other parts of Cleopatra’s palace. The city of Alexandria even plans to offer underwater tours of this wonder.
Bay of Cambay, India: A few years back discovered the remains of a vast 9,500 year old city. This submerged ruin has intact architecture and human remains. More significantly, this find predates all finds in the area by over 5,000 years, forcing historians to reevaluate their understanding of the history of civilazation in the region. The find has been termed Dwarka, or the ‘Golden City,’ after an ancient city-in-the sea said to belong to the Hindu god Krishna.
Kwan Phayao, Thailand: In itself perhaps not unusual, a 500 year old Thai temple sits at the bottom of lake Phayao. What makes this case strange is that the lake was actually made intentionally about 70 years ago, and that there has been recent discussion of potentially restoring the temple at the cost of billions of dollars. However, the ruins serve as a habitat for fish that many have argued should remain untouched.
Yonaguni-Jima, Japan: Discovered by a dive tour guide some twenty years ago, controversies have arisen around a mysterious pyramids found off the coast of Japan. These structures seem to have been carved right out of bedrock in a teraforming process using tools previously thought unavailable to ancient cultures of the region.
Havana, Cuba: A team of scientists continues to explore megalithic ruins found in the Yucatan Channel near Cuba. They have found evidence of an extensive urban environment stretching for miles along the ocean shore. Some believe that the civilization that inhabited these predates all known ancient American cultures. So far, only computer models of this mysterious underwater city exist.
North Sea, Europe: A lost natural landscape was found recently under the North Sea, once occupied by human hunter-gatherers over 10,000 years ago. What were once rivers, lakes and oceans are now all at the bottom of the sea, only made known through digital mapping. Scientists theorize that this amazingly well-preserved landscape was at the heart of an ancient civilization spread across Europe.
Atlantis, Antarctica? Over a hundred years ago, a museum curator in Istanbul made a remarkable discovery. Examining an ancient map on gazelle skin, he found a location marking a mountain chain where Antarctica is today. This map is, amazingly, one of many pieces of evidence people have used to try and claim that, in fact, Antarctica is the fabled lost continent of Atlantis. Other evidence includes the recent discovery (via sonar technology) of land under Antarctica as well as the mapping systems used by ancient cartographers, which suggest Atlantis might have been located far from the Mediterranean Sea.
Enjoy this collection? Be sure to check out 7 Abandoned Wonders of the Postmodern World and 7 More Deserted Wonders of the World. Interested in abandonments? See this article on urban exploration.
Underwater Lost Cities: 7 Submerged Urban Wonders of the World | WebUrbanist
Written by Urbanist on September 12th, 2007 - Topics: 7 Wonders, Architecture, Urban, Urban Images, Various
A wealth of human history lies submerged in ancient cities at the bottoms of lakes, seas and oceans of the world. Some of these were sent into the water via earthquakes, tsunamis or other disasters thousands of years ago. Many have just recently been rediscovered, by accident or through emergent technological innovations. Some have even caused scientists to question the history of human civilization.
Alexandria, Egypt: Off the shores of Alexandria, the city of Alexander the Great, lie what are believed to be the ruins of the royal quarters of Cleopatra. It is believed that earthquakes over 1,500 years ago were responsible for casting this into the sea, along with artifacts, statues and other parts of Cleopatra’s palace. The city of Alexandria even plans to offer underwater tours of this wonder.
Bay of Cambay, India: A few years back discovered the remains of a vast 9,500 year old city. This submerged ruin has intact architecture and human remains. More significantly, this find predates all finds in the area by over 5,000 years, forcing historians to reevaluate their understanding of the history of civilazation in the region. The find has been termed Dwarka, or the ‘Golden City,’ after an ancient city-in-the sea said to belong to the Hindu god Krishna.
Kwan Phayao, Thailand: In itself perhaps not unusual, a 500 year old Thai temple sits at the bottom of lake Phayao. What makes this case strange is that the lake was actually made intentionally about 70 years ago, and that there has been recent discussion of potentially restoring the temple at the cost of billions of dollars. However, the ruins serve as a habitat for fish that many have argued should remain untouched.
Yonaguni-Jima, Japan: Discovered by a dive tour guide some twenty years ago, controversies have arisen around a mysterious pyramids found off the coast of Japan. These structures seem to have been carved right out of bedrock in a teraforming process using tools previously thought unavailable to ancient cultures of the region.
Havana, Cuba: A team of scientists continues to explore megalithic ruins found in the Yucatan Channel near Cuba. They have found evidence of an extensive urban environment stretching for miles along the ocean shore. Some believe that the civilization that inhabited these predates all known ancient American cultures. So far, only computer models of this mysterious underwater city exist.
North Sea, Europe: A lost natural landscape was found recently under the North Sea, once occupied by human hunter-gatherers over 10,000 years ago. What were once rivers, lakes and oceans are now all at the bottom of the sea, only made known through digital mapping. Scientists theorize that this amazingly well-preserved landscape was at the heart of an ancient civilization spread across Europe.
Atlantis, Antarctica? Over a hundred years ago, a museum curator in Istanbul made a remarkable discovery. Examining an ancient map on gazelle skin, he found a location marking a mountain chain where Antarctica is today. This map is, amazingly, one of many pieces of evidence people have used to try and claim that, in fact, Antarctica is the fabled lost continent of Atlantis. Other evidence includes the recent discovery (via sonar technology) of land under Antarctica as well as the mapping systems used by ancient cartographers, which suggest Atlantis might have been located far from the Mediterranean Sea.
Enjoy this collection? Be sure to check out 7 Abandoned Wonders of the Postmodern World and 7 More Deserted Wonders of the World. Interested in abandonments? See this article on urban exploration.
Underwater Lost Cities: 7 Submerged Urban Wonders of the World | WebUrbanist
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