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  #91  
Old 12-25-2018, 06:35 PM
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Steam vs Compressed Air




"Tesla's New Monarch of Machines"

Extract from:

Monarch of Mechanics

"Suppose now we reversed the operation," continued the inventor. "You have seen the disks acting as a pump. Suppose we had water, or air under pressure, or steam under pressure, or gas under pressure, and let it run into the case in which the disks are contained--what would happen?"

"The disks would revolve and any machinery attached to the shaft would be operated--you would convert the pump into an engine," I suggested.

"That is exactly what would happen--what does happen," replied Dr. Tesla. "It is an engine that does all that engineers have ever dreamed of an engine doing, and more. Down at the Waterside power station of the New York Edison Company, through their courtesy, I have had a number of such engines in operation. In one of them the disks are only nine inches in diameter and the whole working part is two inches thick. With steam as the propulsive fluid it develops 110-horse power, and could do twice as much."
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  #92  
Old 12-31-2018, 03:47 AM
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Everything slowed down a lot at xmas.

This is a deviation from what Tesla patented, however as the single bladed disc performed well for torque and also ease of manufacture.

Our builder in Idaho has come up with a 2 stage turbine with two 2nd stage fluid pumps!

The design has been tweaked to 2 bladed propeller because of this video:



Here is his design!

https://www.dropbox.com/s/73cavxeyqz...haust.mp4?dl=0

What it will do yet we are about to find out from my next post!!!!
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  #93  
Old 12-31-2018, 11:48 AM
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Quote:
Originally Posted by soundiceuk View Post
Everything slowed down a lot at xmas.

This is a deviation from what Tesla patented, however as the single bladed disc performed well for torque and also ease of manufacture.

Our builder in Idaho has come up with a 2 stage turbine with two 2nd stage fluid pumps!

The design has been tweaked to 2 bladed propeller because of this video:



Here is his design!

https://www.dropbox.com/s/73cavxeyqz...haust.mp4?dl=0

What it will do yet we are about to find out from my next post!!!!

Neither of those videos have anything even remotely connected to the Tesla Turbine. The beautiful plastic turbine is a variation of a BLADED turbine. The Tesla Turbine is BLADELESS. It uses the laminar flow of the air past the discs to move the discs. It does not try to catch the air with the blades. The plastic turbine may work very well but it is NOT anything like a real Tesla Turbine. You need to change the title of this thread if you are going to change the design to something so different from the Tesla Turbine.

I fly RC airplanes. The two bladed test versus the 3 bladed test also means nothing. The difference in thrust between the two can easily be caused by the difference in pitch of the blades. the difference in the diameter of the blades and the difference in the motors used. Those motors have a very wide range of RPMs based on the design of the motor. If you put the proper motor with the two bladed prop it can out perform the three bladed prop even when both motors are the same. And what does that test have to do with the Tesla Turbine? It operates on a totally different principle as I just explained.

Respectfully,
Carroll
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  #94  
Old 12-31-2018, 12:25 PM
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You are correct in saying the rotor is not a true Tesla turbine.

I myself and others are building a true Tesla turbine which will follow the patents as closely as possible.


The builder of the build under discussion cannot CNC mill thin parts.

I have offered to cut the discs for him when he settles on the dimensions.

These blades are interchangeable with discs for comparison.

The casing he has built is completely based on the Tesla turbine patents.

The diverging inlet and outlet for example.

The twin two stage is an unknown.


Here is a two stage Tesla turbine wooden build from one of our other members:



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  #95  
Old 12-31-2018, 06:18 PM
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Yes, Tesla does not rate machines with blades, buckets, vanes, pistons or reciprocation as they cause turbulence and restrict fluid velocity.

He makes that very clear in many of his patents.


There is actually a British patent that I'm cleaning up that advocates the use of turbines with blades or vanes in conjunction with the original Tesla turbine.

Most folks have never seen it.


However, I do see it as Tesla drawing attention to the fact the turbine patent is actually two stage or more!

I'm cleaning up all the British patents that are related.

I'll post it when done!

So, if it works, it works and the simpler the better!

He actually patented the two stage turbine machine in more countries than any other patent.



Here is a video of the assembled twin two stage turbine US Idaho build:

https://www.dropbox.com/s/cshyj1mnuv...t%202.mp4?dl=0
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  #96  
Old 01-01-2019, 09:04 PM
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Tesla Turbo © Copyright 2019 - All Rights Reserved - Open Source Project

Tesla Turbo © Copyright 2019 - All Rights Reserved - Open Source Project

The ultimate energy source for 2019 and beyond!

https://www.dropbox.com/s/xjto75krz7...0v0.1.m4v?dl=0



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  #97  
Old 01-01-2019, 10:51 PM
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Happy New Year Paul

Interesting efficiency boost window you got there
Do you think it's the hand introduced on the output flow that caused this effect?

Keep up the great work

Regards
Luc
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  #98  
Old 01-02-2019, 12:13 AM
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The hand was just coincidence.

There was a synchronisation where the vacuum became stronger and the machine goes into a feedback loop.

Transmitter and Receiver


This build is one Tesla turbine with two Tesla pumps. One either side.

It is a turbocharger than uses ambient air to propel the turbine.

The exhausted air enters the pumps and they increase the vacuum and change the pressure at inlet to a vacuum.

The air goes supersonic as it has a diverging nozzle on the inlet and the two pumps also have diverging nozzles.

The blueprint is in the US Patent 1,061,142 (Fluid Propulsion) and US Patent 1,061,206 (Turbine)

or

British Patent 24,001 - Improved Method of Imparting Energy to or Deriving Energy from a Fluid and Apparatus for use therein

I funded the build and provided the knowledge based on my research.

Putting both stages on one axle was the builders idea although it was done by Tesla in one of the British patents, where he has 3 stages on one axle.

I'm working on cleaning those patents up. I've posted a few already.

There are another load of relevant Tesla patents.

We've combined the clues from all of them.

The aim is to produce a free 3D printer file before the end of January.
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  #99  
Old 01-02-2019, 12:58 AM
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Thanks for the reply and extra details Paul.

I assumed the model you just demonstrated is made of Polycarbonate sheets seeing the dark gray side edges. Can Polycarbonate be 3D printed and be safe at high RPM?... or are you saying you will provide CNC milling files?

Thanks for your great work and sharing

Looking forward to more accelerating demos where a load could be added to govern so not to go in runaway.

Regards
Luc
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  #100  
Old 01-02-2019, 01:27 AM
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The machine is self regulating unless you add the Tesla valvular conduit.







This is one of the designs that will be 3D printable.

It features the turbine and the pump with seperate axles, geared by air!

It follows Tesla's US patents a lot more than having both stages on one axle.

There is no completely transparent 3D printable material...... yet

Yes this build is Lexan, you are correct. It has rubber gaskets.
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  #101  
Old 01-02-2019, 01:35 AM
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Did you use a CNC to cut your Lexan (polycarbonate)?

Regards
Luc
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  #102  
Old 01-02-2019, 01:55 AM
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Yes it is CNC cut using a Stepcraft 420
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  #103  
Old 01-24-2019, 02:41 PM
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Hi folks! Here is an update!

Iíve been without a PC for most of the month, hence my limited posts.

Iíve been working with a professional CAD man on a 3D printable design.

The skateboard bearings are off the shelf. The key steel is off the shelf.

The axle will need to be turned on a lathe.

The casing will be 3D printable or it can be machined.

The rotor can be 3D printed or machined.

I would like to give away this design to as many people as possible from this forum and at the same time know how many people have got the files.

It is a design that has more than half as much surface area as Teslaís 200hp version.

I am going to post this publicly but first I would like to know the files are already in a vast number of hands.

If you are interested then please get in touch either on the thread or by PM.

Cheers,

Paul
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  #104  
Old 01-25-2019, 04:14 AM
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yes please.

Hi Paul, thanks for sharing. I'm still calibrating my new Anet E12 (beware!) but this seems like just the project for it.
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  #105  
Old 01-25-2019, 11:26 AM
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Please can you send me your email address.

Also what 3D print materials can your printer do and what is the bed size?
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  #106  
Old 02-04-2019, 03:33 PM
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Hi guys, I've been without a PC for a while. Finally back online with a PC now so can share everything that has been going on.

In January I paid a very talented CAD designer to sit with me and draw my interpretation of Tesla's Mk2 turbine.

This is a combination of the 1913 US Patent 1,061,206 Turbine patent, the 1921 British Patent 186,082 for Tesla's Mk2 Rotor and the 1921 British Patent 179,043

Here are a couple of pictures:






Also I thought I would show you a very basic Turbine and Vacuum combination:

It has two discs and one star washer for the turbine and two discs and one 3 spoke washer for the vacuum.



The turbine hasn't got the right shaped nozzle and the build is not 100% correct.

However if you build this correctly you will suck the heat out of air and run on it!

I'm happy to answer questions on any aspect of my research and development.
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  #107  
Old 02-04-2019, 04:50 PM
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There is much confusion over the Tesla Turbine.

I am going to clear up the confusion with my analysis of the US Patent 1,061,206 and US Patent 1,061,142

It is important to understand that there are actually two machines within the US Patent 1,061,206

One is a turbine and has a diverging nozzle.

One is a rotary engine and has a straight port.

This is why the machine that was burning wood had so much torque.

It had a straight port!

Now that you know this, you can identify that there is a lack of Tesla turbines across the world. What people have built is a Tesla rotary engine.

If you want torque on the primary axle, build a rotary engine. If you want a high speed turbine to propel a second stage machine to take the torque from 2nd stage axle, build a turbine.

Here is my evidence:

Key:

Blue = 1,061,142 Patent = Pump = Machine for propelling fluids

Pink = 1,061,142 Patent = Compressor = Machine for compressing fluids

Green = 1,061,206 Patent = Rotary Engine = Machine for turning other machines from its own shaft

Orange = 1,061,206 Patent = Turbine = Propelling machine for turning second axle geared by air or for turning second rotor on same axle

Yellow = Valvular Conduit reference










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  #108  
Old 02-04-2019, 05:14 PM
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There is also confusion over Tesla's "pump" US Patent 1,061,142

It is also two machines.

A "pump" (runners with tear shaped holes facing in correct direction)

A "compressor" (runners with no holes)


The "pump" is the opposite of the "rotary engine" aka "motor".

The "compressor" is the opposite of the "turbine".


Tesla writes:

"The same principles, however, are capable of embodiment also in that field of mechanical engineering which is concerned in the use of fluids as motive agents, for while in certain respects the operations in the latter case are directly opposite to those met with in the propulsion of fluids, and the means employed may differ in some features, the fundamental laws applicable in the two cases are the same. In other words, the operation is reversible, for if water or air under pressure be admitted to the opening constituting the outlet of a pump or blower as described, the runner is set in rotation by reason of the peculiar properties of the fluid which, in its movement through the device, imparts its energy thereto."









So now the cat's out of the bag! Who is going to get there first!?
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  #109  
Old 02-05-2019, 12:34 AM
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Axle, washers and end plates CAD Drawings

The axle in my turbine prototype holds, 12 runners, 1 centre runner with no exhaust holes, 14 star washers, two end plates, two washers and one 17mm x 1.0 pitch x 8mm width off the shelf nyloc nut.







More to follow.
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  #110  
Old 02-05-2019, 07:15 PM
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M17 x 1.0 Thread
28 mm Diameter
Number of Slots - 4
4 mm Slot Size




Use with DIN1810A Hook Spanner Wrench

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  #111  
Old 02-05-2019, 07:18 PM
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4mm Key Steel

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  #112  
Old 02-06-2019, 06:07 PM
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This is good for visualising what is happening inside the casing.

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  #113  
Old 02-06-2019, 09:02 PM
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The importance of the "diverging nozzle"

If you want to build a machine with plenty of torque, you need a rotor with many discs and a casing with a straight port:

US Patent 1,061,206 TURBINE

"increased number of disks and smaller distance of separation"




If you want to build a prime mover (Tesla Turbine) which it appears no one across the world has done so yet you need a diverging nozzle!

WHY?????



https://en.wikipedia.org/wiki/Gustaf_de_Laval

https://en.wikipedia.org/wiki/De_Laval_nozzle


Reference 1:

"de Laval nozzle
In 1882 he introduced his concept of an impulse steam turbine[2] and in 1887 built a small steam turbine to demonstrate that such devices could be constructed on that scale. In 1890 Laval developed a nozzle to increase the steam jet to supersonic speed, working from the kinetic energy of the steam, rather than its pressure. The nozzle, now known as a de Laval nozzle, is used in modern rocket engine nozzles. De Laval turbines can run at up to 30,000 rpm. The turbine wheel was mounted on a long flexible shaft, its two bearings spaced far apart on either side. The higher speed of the turbine demanded that he also design new approaches to reduction gearing, which are still in use today. Since the materials available at the time were not strong enough for the immense centrifugal forces, the output from the turbine was limited, and large scale electric steam generators were dominated by designs using the alternative compound steam turbine approach of Charles Parsons.[2]

Using high pressure steam in a turbine that had oil-fed bearings meant that some of the steam contaminated the lube-oil, and as a result, perfecting commercial steam-turbines required that he also develop an effective oil/water separator. After trying several methods, he concluded that a centrifugal separator was the most affordable and effective method. He developed several types, and their success established the centrifugal separator as a useful device in a variety of applications."


Reference 2:

"A de Laval nozzle (or convergent-divergent nozzle, CD nozzle or con-di nozzle) is a tube that is pinched in the middle, making a carefully balanced, asymmetric hourglass shape. It is used to accelerate a hot, pressurized gas passing through it to a higher supersonic speed in the axial (thrust) direction, by converting the heat energy of the flow into kinetic energy. Because of this, the nozzle is widely used in some types of steam turbines and rocket engine nozzles. It also sees use in supersonic jet engines."



Here is an example of how a university didn't build to the patent specification, in what appears to be a deliberate attempt to dumb down the machines capabilities.

This video proves that Tesla's machine runs on heat and not pressure.


The turbine was designed to condense air and use the kinetic energy in heat to spin the turbine ultra fast which moves a lot of air, creating a propelling machine.

I think the motor was designed to increase the radial pressure on the discs and the turbine reduce radial pressure.

US Patent 1,061,206 TURBINE

"In the motor, on the contrary, the first named pressure, being opposed to that of supply, reduces the effective head and the velocity of radial flow toward the center."

So what I am saying is the fluid backs up in spiral paths on the motor with straight port, whilst the centrifugal force coming out from the discs fights the radial pressure of the fluid, which gives torque.

With the turbine, the fluid just keeps shooting for the exhaust after completing many concentric circles unhindered at extreme velocity. The faster it spins the longer the concentric pathway because of more spiral turns. The longer the spiral path, the more boundary layer effect there is.

The turbine loves speed and makes its own vacuum.

This can be massively increased to maximum vacuum with a second stage vacuum.

This is the 179,043 British patent which is the same machine in reverse and larger spaces over top and bottom of the rotor for the extremely large amount of fluid being moved.

Here is the patent. This is the best of all of Tesla's patents I have ever read!

The first paragraph is amazing!

Here is the original:

https://www.dropbox.com/s/b6i3avihgr...79043.PDF?dl=0

I've ordered my shaft and washers to be made.

I'm still shopping for machine shops and 3D print companies for the casing.
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  #114  
Old 02-06-2019, 10:56 PM
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This is how my thoughts are settled:

If you want to build the Tesla motor use the pump because it is its opposite.


If you want to build the Tesla turbine use the Mk1 compressor 1,061,142 or Mk2 compressor 179,043 as they are the opposite.


The first machine on each of these is one side of the vortex, the other is the opposite.

The turbine turns heat into cold using centripetal force and the compressor turns cold into hot using centrifugal force.

The motor turns heat into radial pressure (torque) using centripetal force and the pump amplifies the air flow ability because it is adding the centrifugal force to the radial pressure.
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  #115  
Old 02-08-2019, 11:12 AM
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Tesla Turbine Nozzles, Ports & Valves in laymans terms:

Converging Nozzle: Nozzle slows down fluid flow but increases forward pressure out of nozzle. The increase in fluid pressure opposes the incoming atmospheric pressure. The result is lots of back pressure.

For example when you connect a garden hose and the pipe pops off the tap.


Straight Port: The velocity of fluid is constant inside and the fluid velocity slows down on exit into the casing as it has room to expand. The fluid slowing down increases the air pressure which now opposes atmospheric pressure. The result is lots of back pressure.

Diverging Nozzle: The nozzle slows the fluid down as the exit of the nozzle has a bigger surface area than the start of the nozzle. It is an exact opposite of the converging nozzle. My CAD guy reckons 5% is a good starting point and then figure out what angle works best. My CAD guy has a masters degree in marine engineering and mechanical engineering.

The velocity of the fluid slows down at the top of the nozzle and then speeds up to maximum velocity when it meets the rotor and it tries to get to the exhaust holes as fast as it can!

Air has the ability to reach supersonic speeds and more once this chain reaction has started.

The velocity increasing out of the nozzle causes a lower pressure inside.

Think of how fast the back door slams when you open the front door!

Same chain reaction, only the rotor will be turned even more each time.


All engines have become over complicated as it serves to make big business more money.

Time to reset the stage!


Valve: The Tesla valve turns the back pressure around and turns it into forward pressure.

Have fun with the valve! Files coming soon!
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  #116  
Old 02-10-2019, 10:39 PM
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I've almost finished my rotor made from stainless steel 316.

I've still got to fit the rotor to the shaft and true the discs on a lathe.

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  #117  
Old 02-10-2019, 11:07 PM
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Here is an update on the 3D printed version in Brighton, UK.

I am told they are working on motorised inlet, exhaust and re circulation valves.

They should have this up and running this month.



















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  #118  
Old 02-11-2019, 08:32 PM
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Wow, professional design/build. Looking forward on how it is working!

Regards Roland
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  #119  
Old 02-11-2019, 11:46 PM
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"The Problem of Increasing Human Energy" by Nikola Tesla

The Problem of Increasing Human Energy - Nikola Tesla 1900


"It is possible, and even probable, that there will be, in time, other resources of energy opened up, of which we have no knowledge now. We may even find ways of applying forces such as magnetism or gravity for driving machinery without using any other means. Such realizations, though highly improbable, are not impossible. An example will best convey an idea of what we can hope to attain and what we can never attain. Imagine a disk of some homogeneous material turned perfectly true and arranged to turn in frictionless bearings on a horizontal shaft above the ground. This disk, being under the above conditions perfectly balanced, would rest in any position. Now, it is possible that we may learn how to make such a disk rotate continuously and perform work by the force of gravity without any further effort on our part; but it is perfectly impossible for the disk to turn and to do work without any force from the outside. If it could do so, it would be what is designated scientifically as a "perpetuum mobile," a machine creating its own motive power. To make the disk rotate by the force of gravity we have only to invent a screen against this force. By such a screen we could prevent this force from acting on one half of the disk, and the rotation of the latter would follow. At least, we cannot deny such a possibility until we know exactly the nature of the force of gravity. Suppose that this force were due to a movement comparable to that of a stream of air passing from above toward the center of the earth. The effect of such a stream upon both halves of the disk would be equal, and the latter would not rotate ordinarily; but if one half should be guarded by a plate arresting the movement, then it would turn."

"But was it not possible to realize a similar condition without necessarily going to a height? Conceive, for the sake of illustration, [a cylindrical] enclosure T, as illustrated in diagram b, such that energy could not be transferred across it except through a channel or path O, and that, by some means or other, in this enclosure a medium were maintained which would have little energy, and that on the outer side of the same there would be the ordinary ambient medium with much energy. Under these assumptions the energy would flow through the path O, as indicated by the arrow, and might then be converted on its passage into some other form of energy. The question was, Could such a condition be attained? Could we produce artificially such a "sink" for the energy of the ambient medium to flow in? Suppose that an extremely low temperature could be maintained by some process in a given space; the surrounding medium would then be compelled to give off heat, which could be converted into mechanical or other form of energy, and utilized. By realizing such a plan, we should be enabled to get at any point of the globe a continuous supply of energy, day and night. More than this, reasoning in the abstract, it would seem possible to cause a quick circulation of the medium, and thus draw the energy at a very rapid rate."

"Here, then, was an idea which, if realizable, afforded a happy solution of the problem of getting energy from the medium. But was it realizable? I convinced myself that it was so in a number of ways, of which one is the following. As regards heat, we are at a high level, which may be represented by the surface of a mountain lake considerably above the sea, the level of which may mark the absolute zero of temperature existing in the interstellar space. Heat, like water, flows from high to low level, and, consequently, just as we can let the water of the lake run down to the sea, so we are able to let heat from the earth's surface travel up into the cold region above. Heat, like water, can perform work in flowing down, and if we had any doubt as to whether we could derive energy from the medium by means of a thermopile, as before described, it would be dispelled by this analogue. But can we produce cold in a given portion of the space and cause the heat to flow in continually? To create such a "sink," or "cold hole," as we might say, in the medium, would be equivalent to producing in the lake a space either empty or filled with something much lighter than water. This we could do by placing in the lake a tank, and pumping all the water out of the latter. We know, then, that the water, if allowed to flow back into the tank, would, theoretically, be able to perform exactly the same amount of work which was used in pumping it out, but not a bit more. Consequently nothing could be gained in this double operation of first raising the water and then letting it fall down. This would mean that it is impossible to create such a sink in the medium. But let us reflect a moment. Heat, though following certain general laws of mechanics, like a fluid, is not such; it is energy which may be converted into other forms of energy as it passes from a high to a low level. To make our mechanical analogy complete and true, we must, therefore, assume that the water, in its passage into the tank, is converted into something else, which may be taken out of it without using any, or by using very little, power. For example, if heat be represented in this analogue by the water of the lake, the oxygen and hydrogen composing the water may illustrate other forms of energy into which the heat is transformed in passing from hot to cold. If the process of heat transformation were absolutely perfect, no heat at all would arrive at the low level, since all of it would be converted into other forms of energy. Corresponding to this ideal case, all the water flowing into the tank would be decomposed into oxygen and hydrogen before reaching the bottom, and the result would be that water would continually flow in, and yet the tank would remain entirely empty, the gases formed escaping. We would thus produce, by expending initially a certain amount of work to create a sink for the heat or, respectively, the water to flow in, a condition enabling us to get any amount of energy without further effort. This would be an ideal way of obtaining motive power. We do not know of any such absolutely perfect process of heat-conversion, and consequently some heat will generally reach the low level, which means to say, in our mechanical analogue, that some water will arrive at the bottom of the tank, and a gradual and slow filling of the latter will take place, necessitating continuous pumping out. But evidently there will be less to pump out than flows in, or, in other words, less energy will be needed to maintain the initial condition than is developed by the fall, and this is to say that some energy will be gained from the medium. What is not converted in flowing down can just be raised up with its own energy, and what is converted is clear gain. Thus the virtue of the principle I have discovered resides wholly in the conversion of the energy on the downward flow."
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"Having recognized this truth, I began to devise means for carrying out my idea, and, after long thought, I finally conceived a combination of apparatus which should make possible the obtaining of power from the medium by a process of continuous cooling of atmospheric air. This apparatus, by continually transforming heat into mechanical work, tended to become colder and colder, and if it only were practicable to reach a very low temperature in this manner, then a sink for the heat could be produced, and energy could be derived from the medium. This seemed to be contrary to the statements of Carnot and Lord Kelvin before referred to, but I concluded from the theory of the process that such a result could be attained. This conclusion I reached, I think, in the latter part of 1883, when I was in Paris, and it was at a time when my mind was being more and more dominated by an invention which I had evolved during the preceding year, and which has since become known under the name of the "rotating magnetic field." During the few years which followed I elaborated further the plan I had imagined, and studied the working conditions, but made little headway. The commercial introduction in this country of the invention before referred to required most of my energies until 1889, when I again took up the idea of the self-acting machine. A closer investigation of the principles involved, and calculation, now showed that the result I aimed at could not be reached in a practical manner by ordinary machinery, as I had in the beginning expected. This led me, as a next step, to the study of a type of engine generally designated as "turbine," which at first seemed to offer better chances for a realization of the idea. Soon I found, however, that the turbine, too, was unsuitable. But my conclusions showed that if an engine of a peculiar kind could be brought to a high degree of perfection, the plan I had conceived was realizable, and I resolved to proceed with the development of such an engine, the primary object of which was to secure the greatest economy of transformation of heat into mechanical energy. A characteristic feature of the engine was that the work-performing piston was not connected with anything else, but was perfectly free to vibrate at an enormous rate. The mechanical difficulties encountered in the construction of this engine were greater than I had anticipated, and I made slow progress. This work was continued until early in 1892, when I went to London, where I saw Professor Dewar's admirable experiments with liquefied gases. Others had liquefied gases before, and notably Ozlewski and Pictet had performed creditable early experiments in this line, but there was such a vigor about the work of Dewar that even the old appeared new. His experiments showed, though in a way different from that I had imagined, that it was possible to reach a very low temperature by transforming heat into mechanical work, and I returned, deeply impressed with what I had seen, and more than ever convinced that my plan was practicable. The work temporarily interrupted was taken up anew, and soon I had in a fair state of perfection the engine which I have named "the mechanical oscillator." In this machine I succeeded in doing away with all packings, valves, and lubrication, and in producing so rapid a vibration of the piston that shafts of tough steel, fastened to the same and vibrated longitudinally, were torn asunder. By combining this engine with a dynamo of special design I produced a highly efficient electrical generator, invaluable in measurements and determinations of physical quantities on account of the unvarying rate of oscillation obtainable by its means. I exhibited several types of this machine, named "mechanical and electrical oscillator," before the Electrical Congress at the World's Fair in Chicago during the summer of 1893, in a lecture which, on account of other pressing work, I was unable to prepare for publication. On that occasion I exposed the principles of the mechanical oscillator, but the original purpose of this machine is explained here for the first time."
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