The First Perpetual Motion Machine: History and How It Was Meant to Work

A perpetual motion machine — the fabled perpetuum mobile — is a hypothetical device that would run forever and produce useful work without any external energy source. No such machine has ever worked, because every real machine must obey the laws of thermodynamics, and a perpetual motion machine violates them. The idea is impossible in principle, yet it captivated inventors for centuries.

In the Middle Ages, while alchemists and sorcerers searched for the "philosopher's stone" and mixed mysterious substances in their retorts hoping to make gold and an "elixir of life," a different kind of dreamer sat in workshops. These were mechanics who tinkered over large vats fitted with water wheels and pumps.

Their goal was to build a perpetuum mobile — the first perpetual motion machine — a contraption that would perform useful work without spending any energy drawn from outside itself.

The medieval mechanics' dream of a perpetual motion machine

Medieval mechanics believed a self-sustaining machine was within reach, and they poured years of labour into building one. Unlike the alchemists chasing gold, these craftsmen worked with the tangible tools of their trade — wheels, gears, levers, and pumps. Their reasoning seemed sound: if falling water could turn a wheel, and the turning wheel could lift the water back up, why should the cycle ever stop? The flaw in that logic would not be fully understood for centuries, but the ambition itself pushed the study of physics and mechanics forward.

The water-driven perpetuum mobile from a 16th-century manuscript

An old 16th-century manuscript preserves a drawing of one such "miraculous" machine — a water-powered perpetuum mobile. It was meant to spin a large abrasive grinding wheel on which a craftsman could sharpen scissors, knives, and sabres. There was nothing remarkable about the task itself: thousands of water wheels beside streams did exactly the same job. The only difference was that this water wheel stood not by a stream but in the middle of a large workshop, inside an enormous vat.

How the water machine was built: wheel, pump, and grindstone

The unknown mechanic who designed this machine hoped to outwit water itself. From a roof-shaped trough placed up high, he directed a jet of water onto a bladed wheel. As it fell on the paddles, the water set the wheel in motion, and with it the shaft carrying the grinding wheel. The water then collected in the large vat below — but it had to be lifted back up into the trough.

To achieve this, the mechanic installed a pump inside the vat. Falling from above, the water did double duty: it turned the grindstone and, by way of a crank, raised and lowered the pump's piston. The pump forced water up into the trough, from which it began its journey all over again. At the same time, a thin stream trickled out of the trough to wet the grinding wheel. At first everything went well, and the machine ran for several days without troubling anyone.

Why the machine stopped: the riddle of the heated shaft

Then the water wheel and the pump piston began to move more and more slowly, until at last they halted completely. The mechanic inspected the trough and the water wheel but found nothing broken. Only when he examined the shaft on which the water wheel was mounted did he notice that the shaft had grown hot. The pump cylinder had heated up as well. What could explain this?

Friction and the conversion of energy into heat

The answer lay in friction. Between the shaft and the wheel, and between the cylinder and the piston, friction was taking place, and friction generates heat. People knew this long before matches existed — they rubbed two pieces of wood together to make fire, and in winter we rub our cold hands together to warm them. But rub your hands long enough and they tire: the heat is produced at the expense of the work your hands do.

The same thing happened inside the perpetuum mobile: the energy of the falling water's motion was converted into heat, and the first perpetual motion machine ground to a stop. This is the core reason every such device fails. In any real machine, part of the energy is continually siphoned off as heat, sound, and wear, so the output can never equal the input needed to keep the cycle alive. The mechanic did not understand this and kept on tinkering; only later did people realise he had reached a dead end. This principle — that friction irreversibly bleeds ordered motion into scattered heat — is a preview of the second law of thermodynamics that would be formalised centuries afterward.

Historical designs for perpetual motion machines

Perpetual motion machine designs stretch across roughly a thousand years of history, and almost all of them recycle a handful of clever-looking tricks: unbalanced wheels, self-filling water systems, rolling balls, and magnets. Each generation was convinced it had found the missing piece, and each design failed for the same underlying reason — energy losses that no arrangement of parts can eliminate.

Famous attempts to build a perpetuum mobile

Some of the earliest recorded proposals came from the Indian mathematician and astronomer Bhaskara, who around the 12th century sketched an overbalanced wheel with curved spokes partly filled with mercury, believing the shifting weight would keep it turning forever. The Irish natural philosopher Robert Boyle later proposed a self-flowing flask, a closed loop in which water was supposed to circulate endlessly on its own. Both designs looked promising on paper and both failed in practice, because neither could return more energy than it lost to friction and drag. Notable attempts include:

• Overbalanced wheels — weighted or mercury-filled wheels meant to stay perpetually lopsided, as in Bhaskara's design.
• Self-flowing water systems — closed circuits like Robert Boyle's flask and the 16th-century workshop grindstone.
• Capillary and buoyancy machines — devices relying on water rising through wicks or floats endlessly cycling.
• Magnetic motors — arrangements of magnets claimed to spin a rotor without ever stopping.

Perpetual motion machines of the first kind

A perpetual motion machine of the first kind is a device that would produce work without consuming any energy at all — creating energy out of nothing. This class of machine violates the first law of thermodynamics, the conservation of energy. The medieval water grindstone belongs here: its builder hoped the machine would sustain its own operation and still spare energy to sharpen blades, which would mean energy appearing from nowhere.

Perpetual motion machines of the second kind

A perpetual motion machine of the second kind does not try to create energy; instead it tries to convert heat entirely into useful work, drawing thermal energy from a single reservoir with perfect efficiency. This class violates the second law of thermodynamics. Such a machine would, for example, extract heat from the ocean and turn it wholly into motion with no waste — something nature never permits, because some energy always disperses into a colder surrounding.

The laws of thermodynamics and the impossibility of perpetual motion

The laws of thermodynamics are the reason perpetual motion is impossible, and every failed machine in history runs aground on one of them. Thermodynamics is the branch of physics that describes how energy moves and transforms, and its first two laws close every loophole a perpetual motion inventor might hope to exploit.

The first law of thermodynamics (conservation of energy)

The first law of thermodynamics states that energy cannot be created or destroyed, only converted from one form into another. This is the law of conservation of energy, and it forbids any machine from producing more energy than it takes in. The energy of the falling water in the medieval machine did not vanish — it turned into heat in the warm shaft and cylinder. A machine that seemed to lose its motion was in fact obeying this law perfectly: every joule was accounted for, just no longer in a useful form.

The second law of thermodynamics and entropy

The second law of thermodynamics introduces entropy, a measure of disorder that always tends to increase in an isolated system. Energy naturally spreads out and degrades from concentrated, usable forms into diffuse heat, and this process cannot spontaneously reverse. Entropy is why the grindstone's ordered spinning decays into random molecular jostling — warmth — and never gathers itself back into motion. Because entropy always rises, no machine can run forever without an external energy supply, which is the deepest reason perpetual motion is impossible.

Lavoisier and the session of the Paris Academy of Sciences

The French chemist Antoine Lavoisier, who decomposed water into its constituent parts and explained the process of combustion, prepared the ground for a scientific understanding of the processes taking place in nature. If you recall that stormy session of the Paris Academy of Sciences where Lavoisier opened the path to that understanding (for more, see Lavoisier's Law) — it was at almost the same time, in the same hall and among the same circle of scientists, on a May day some 250 years ago, that the perpetuum mobile, the perpetual motion machine, was declared impossible in principle.

The official ban on considering perpetual motion projects

The Paris Academy of Sciences formally resolved to stop examining proposals for perpetual motion machines, judging that they contradicted the law of conservation of energy and had therefore never been viable. This ruling saved the Academy's members from an endless stream of hopeless submissions and set a precedent that later institutions followed. In the modern era, the United States Patent and Trademark Office (USPTO) maintains a comparable policy: it refuses to grant patents for machines claiming perpetual motion, generally requiring a working model before it will even consider such applications — a rare demand in patent law.

The law of conservation of energy for every machine on the planet

The law of conservation of energy applies not only to the perpetuum mobile but to every machine on Earth. Whatever energy a device delivers must be paid for by an equal amount of energy supplied to it; no machine can be a net creator of energy.

The formula: energy received = energy spent

Energy received = energy spent

Whenever you want to recall this relationship, think of rubbing your hands together — the warmth you feel is exactly the work your muscles put in, converted into heat, never more.

The "Maxwell's Demon" thought experiment

Maxwell's Demon is a famous thought experiment devised by the Scottish physicist James Clerk Maxwell in 1867 to probe whether the second law of thermodynamics could be cheated. Maxwell imagined a tiny intelligent being — later dubbed a "demon" — guarding a trapdoor between two gas chambers, letting fast molecules pass one way and slow ones the other. In principle the demon would create a temperature difference from nothing, seemingly reducing entropy for free. The resolution, worked out over the following century, is that the demon must gather, store, and erase information about the molecules, and that information processing itself costs energy and generates entropy. The demon therefore obeys the second law after all, and perpetual motion remains impossible.

Scientists and inventors in the history of energy

The story of energy science was written by a chain of inventors and physicists whose work either exposed perpetual motion as a fantasy or opened genuine paths to power. James Clerk Maxwell reframed the limits of thermodynamics with his demon; Robert Boyle experimented with self-flowing devices before the conservation laws were understood; and the physicist R.P. Feynman later gave a celebrated lecture dismantling the ratchet-and-pawl device, showing precisely why a molecular machine cannot run on thermal noise alone. Their biographies share a common thread: rigorous scepticism turned wishful engineering into testable physics. Writers such as Mary Bellis and David Grossman have since chronicled these figures for general audiences through outlets like PopularMechanics.com, keeping the history accessible.

Fraud and false patents for perpetual motion machines

Perpetual motion has attracted not only sincere dreamers but also outright fraud and misleading patent claims. Because the promise of "free energy" is so seductive, inventors and promoters have repeatedly marketed devices that cannot possibly work, sometimes soliciting investment on the strength of impressive but unverifiable demonstrations.

Joe Newman's "free energy" claims

Joe Newman was an American inventor who, in the 1980s, claimed to have built an energy machine that produced far more electrical output than it consumed — effectively free energy. His device drew wide media attention, but when the National Bureau of Standards tested it, the machine failed to deliver the surplus energy Newman claimed. The USPTO refused him a patent precisely because the invention would amount to a perpetual motion machine. Newman's case became a textbook example of how compelling showmanship cannot override the conservation of energy.

Scientific scepticism and criticism of perpetual motion projects

Scientific institutions treat perpetual motion claims with firm scepticism, and organisations such as the American Physical Society and the USPTO reject them on principle rather than case by case. The reasoning is not closed-mindedness but consistency: a machine that genuinely produced net energy would overturn the most thoroughly tested laws in all of physics. Reviewers therefore ask claimants for independently verified, repeatable measurements — a burden of proof that no perpetual motion device has ever met.

Real energy sources instead of a perpetual motion machine

Because perpetual motion cannot supply power, real progress in energy comes from harnessing existing sources more cleverly and storing what we capture. The genuine frontier is not free energy but higher efficiency, cleaner fuels, and better storage — all of which respect the laws of thermodynamics rather than defy them.

Alternative and renewable energy sources

Alternative and renewable energy sources tap flows of energy that are continuously replenished, such as sunlight, wind, flowing water, and geothermal heat. These are not perpetual motion — each draws on an external supply, ultimately the Sun or the Earth's interior — but they can operate for as long as that supply lasts, effectively indefinitely on human timescales. Solar panels, wind turbines, and hydroelectric dams are the practical descendants of the old water wheel, minus the impossible dream of self-sustenance.

Nuclear reactors and nuclear fusion

Nuclear reactors generate power by splitting heavy atomic nuclei in a controlled chain reaction, releasing enormous energy from a small mass of fuel. Nuclear fusion, by contrast, fuses light nuclei such as hydrogen isotopes and powers the Sun itself; the physicist Arthur Ruhlig first observed deuterium–tritium fusion in the laboratory in 1938, a reaction now central to fusion energy research. Fusion promises abundant power with little long-lived waste, though sustaining a net-energy reaction on Earth remains one of the hardest challenges in physics.

Hydrogen energy and hydrogen reserves

Hydrogen energy uses hydrogen as a clean fuel that releases only water when burned or run through a fuel cell. Hydrogen is the most abundant element in the universe, but on Earth it is almost always locked inside compounds such as water and hydrocarbons, so it must be extracted using energy from another source. This makes hydrogen an energy carrier rather than a primary reserve — valuable for storing and transporting energy, not for creating it.

Super batteries and energy storage

Super batteries and advanced storage systems address the biggest weakness of renewable power: the Sun does not always shine and the wind does not always blow. High-capacity batteries, supercapacitors, and flow batteries store surplus energy when generation is high and release it when demand peaks. Storage does not create energy — it only holds and returns it, minus small losses — but it is what allows intermittent renewables to behave like reliable, on-demand power.

Time crystals and systems in equilibrium

Time crystals are an exotic phase of matter, first proposed by Frank Wilczek in 2012 and later realised experimentally, whose structure repeats in time rather than only in space. They are sometimes mistaken for perpetual motion because their pattern oscillates without settling down. Crucially, however, a time crystal exists in a stable ground state and cannot be used to extract work — it performs no useful energy output — so it fully respects the laws of thermodynamics and is not a perpetual motion machine.

The energy technologies of the future

The future of energy lies in innovation that squeezes more useful work from every joule while shrinking waste, not in overturning physics. Research fronts include practical nuclear fusion, next-generation solar cells, grid-scale storage, green hydrogen production, and smarter systems that recover energy otherwise lost as heat. Publications such as The Verge, Rolling Stone, and The New Republic have all covered the surge of interest in these fields, reflecting how energy innovation has moved from fringe curiosity to mainstream priority. The lesson of the perpetuum mobile endures: the winning strategy is efficiency and conservation, never the illusion of energy from nothing.

Conclusions: why perpetual motion is impossible

A perpetual motion machine is impossible because it would have to break the laws of thermodynamics, and those laws have never failed a test. The first law forbids any machine from producing more energy than it receives, while the second law guarantees that some energy always degrades into unrecoverable heat as entropy rises. The medieval water grindstone stopped for exactly this reason — friction turned its motion into warmth — and every scheme since, from Bhaskara's wheel to Joe Newman's motor, has met the same fate. Real energy progress comes from renewables, nuclear power, hydrogen, and better storage, all of which obey physics rather than promise to defy it. Whenever the dream of free energy resurfaces, the simplest reminder is still the oldest one: rub your hands together, feel the heat, and remember that the warmth is only the work you put in.