Robert Hooke

• 1. Introduction

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  Robert Hooke died in London on the 3rd of March 1703, alone in his room at Gresham College, blind and bedridden. When his belongings were searched, a chest was found containing £8,000 in money and gold. His library held over 3,000 books in Latin, French, Italian, and English. No authenticated portrait of him survives. The man who coined the word "cell", who built the air pump that made Boyle's Law possible, who designed the Monument to the Great Fire of London and surveyed more than half of the city's damaged property lines, who proposed a wave theory of light and anticipated arguments for biological evolution by nearly two centuries, died without a will, without a confirmed likeness, and without the fame his discoveries should have guaranteed. How did a boy from Freshwater on the Isle of Wight, frail at birth and not expected to survive, become what later generations would call "England's Leonardo"? And how did that same man spend centuries afterward dismissed as a bitter, scheming footnote to Isaac Newton's story?

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• 2. A Frail Boy from Freshwater

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  Hooke was born on the 18th of July 1635 in Freshwater, Isle of Wight, the youngest of four siblings by seven years. His father, John Hooke, was an Anglican curate at All Saints' Church in the same town. Robert was so sickly at birth that those around him did not expect him to live.

  Formal schooling was largely withheld from him. His father provided some instruction in English, Latin grammar, and divinity, but mostly left the boy to his own devices. What filled that space was mechanical curiosity. Seeing a brass clock taken apart, the young Robert built a working replica from wood. The toy clocks were only the beginning.

  John Hooke died in October 1648, leaving £40 to Robert in his will, with another £10 held over from his grandmother's estate. At thirteen, Robert took that inheritance to London. His first plan was to apprentice with the celebrated painter Peter Lely, and he did receive some instruction in drawing from the limner Samuel Cowper. But the smell of oil paints worsened the chronic headaches that would plague him for life, and he pivoted instead to Westminster School, where he lived with the schoolmaster Richard Busby.

  At Westminster, the frail boy from the Isle of Wight mastered Latin, Greek, and Euclid's Elements. He learned the organ. He began a lifelong study of mechanics. The drawing skills he had started to develop in Lely's studio stayed with him too, and years later those skills would produce the meticulous illustrations inside Micrographia.

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• 3. Oxford and Robert Boyle

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  In 1653, Hooke secured a place at Christ Church, Oxford, earning free tuition and accommodation by serving as an organist and chorister, with a basic income as a servitor. He did not officially matriculate until 1658, but the Oxford years shaped every scientific ambition that followed.

  Through the Oxford Philosophical Club, which had been founded by John Wilkins and would later form the nucleus of the Royal Society, Hooke met Christopher Wren, Seth Ward the Savilian Professor of Astronomy, and Thomas Willis, a physician and chemist. For Willis he was an assistant; for Ward he designed a mechanism that improved the regularity of pendulum clocks used in astronomical timekeeping. In 1659, Hooke described to the club a method of heavier-than-air flight, concluding that human muscles were not equal to the task.

  When Robert Boyle moved to Oxford in 1655, Hooke became his assistant, though the relationship quickly became more equal. Boyle was working on the behavior of gases, a field then haunted by Aristotle's dictum that nature abhors a vacuum. Rather than use the pump built by Ralph Greatorex, which Hooke considered "too gross to perform any great matter", Hooke designed a superior air pump from scratch. It was this pump that made Boyle's experiments on gas pressure possible, and it was Boyle's Law that emerged from them, though Hooke had what the source describes as "a particularly keen eye" and was "an adept mathematician, neither of which applied to Boyle". Hooke also taught Boyle Euclid's Elements and Descartes's Principles of Philosophy. Their shared work led both men to recognise fire as a chemical reaction, not the fundamental element Aristotle had claimed.

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• 4. Curator of Everything

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  The Royal Society for the Improvement of Natural Knowledge by Experiment was founded in 1660 and received its Royal Charter in July 1662. On the 5th of November 1661, Robert Moray proposed appointing a curator to supply the Society with experiments; Hooke was named on Boyle's recommendation, and on the 11th of January 1665 he was confirmed Curator by Office for life, with a salary of £80 per year drawn from both the Society and a £50 annuity settled by a merchant named John Cutler.

  Hooke's role was to demonstrate experiments, either from his own methods or at members' suggestions. His earliest demonstrations covered the nature of air, the implosion of glass bubbles sealed with hot air, and a remarkable experiment in which a dog was kept alive with its chest opened, provided air was pumped continuously in and out of its lungs. He also demonstrated the difference between venous and arterial blood, measured barometric pressure at varying heights, and observed pendulums up to 200 feet long. His biographer described him as England's first meteorologist, pointing to his essay on weather-record keeping, which specifies that a thermometer, a hygrometer, a wind gauge, and a record sheet are all required for proper observations.

  Henry Robinson, the Royal Society's Librarian in 1935, put it plainly: "Without his weekly experiments and prolific work the Society could scarcely have survived, or, at least, would have developed in a quite different way." The librarian's judgment was that Hooke was, historically, the creator of the Royal Society. That claim might seem extravagant until you consider how much of his career he spent demonstrating, designing, and delivering results that other men then built upon, including a 1664 endowment from John Cutler that specifically funded a lectureship at Gresham College on the condition that the Society appoint Hooke to fill it.

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• 5. Micrographia and the Living World

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  In 1663 and 1664, Hooke made the microscopic observations he would collect into Micrographia, published in 1665. Samuel Pepys read the book in a sitting that lasted until two in the morning, writing in his diary on the 21st of January that it was "the most ingenious book that ever I read in my life".

  The book contains the earliest recorded observation of a microorganism, the microfungus Mucor. More lastingly, Hooke coined the word "cell" to describe the structures he observed in plant tissue, finding a resemblance to the small rooms, or cells, of a honeycomb. The hand-crafted, leather-and-gold-tooled microscope he designed for these observations, built by Christopher Cock in London, is now held at the National Museum of Health and Medicine in Maryland.

  Micrographia also addresses combustion. Hooke's experiments led him to conclude that burning requires a specific component of air. He drew the same conclusion about respiration. The chemist Partington later wrote that if Hooke had continued these experiments, it is probable he would have discovered oxygen.

  Hooke's work on fossils extended the same empirical rigor to questions that were theologically charged. An observation of fossil wood in Micrographia led him to conclude that fossilised shells and petrified wood were genuine remains of once-living things, soaked in mineral-laden water over long periods. Despite objections from naturalists like John Ray, who found the concept of extinction theologically unacceptable, Hooke argued that some fossils represented species lost to geological catastrophe. In a series of lectures in 1668, he proposed that volcanoes and earthquakes had shaped the Earth's surface, and that earthquakes explained why shell fossils appeared far above sea level. In 1835, the Scottish geologist Charles Lyell called Hooke's treatise on these subjects "the most philosophical production of that age, in regard to the causes of former changes in the organic and inorganic kingdoms of nature".

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• 6. Gravity, Newton, and a Disputed Idea

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  In 1665, Hooke argued in Micrographia for an attracting principle of gravitation, at a time when many of his contemporaries, including Isaac Newton, still believed in aether as the medium through which celestial bodies influenced one another. In 1666, he communicated to the Royal Society three propositions: that all heavenly bodies attract each other within their spheres of action, that all bodies in simple motion continue in a straight line unless deflected by an extraneous force, and that gravitational attraction grows stronger as bodies draw closer. He did not yet know the mathematical form of that relationship. He wrote in 1674: "Now what these several degrees are I have not yet experimentally verified."

  In November 1679, Hooke initiated a correspondence with Newton, ostensibly to inform him of Hooke's new role managing the Society's correspondence. The exchange grew substantive. On the 6th of January 1680, Hooke wrote to Newton communicating his supposition "that the Attraction always is in a duplicate proportion to the Distance from the Centre" - in other words, an inverse square relationship. Newton's response was cool; he later disputed that Hooke had told him anything new.

  In 1686, when Newton's Principia was presented to the Royal Society, Hooke claimed he had given Newton the notion of the inverse square law. Newton denied authorship could rest with Hooke and pointed out that without mathematical demonstration, Hooke could only guess the law was approximately valid at great distances. Edmond Halley reported contemporaneously that Hooke himself conceded the mathematical demonstration of the curves was wholly Newton's.

  In 1759, the astronomer Alexis Clairaut reviewed Hooke's published work on gravitation and wrote - as reported by Stephen Peter Rigaud - that Hooke and Kepler together showed "what a distance there is between a truth that is glimpsed and a truth that is demonstrated". The historian I. Bernard Cohen put it differently: "In asking for too much credit, Hooke effectively denied to himself the credit due him for a seminal idea."

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• 7. Springs, Clocks, and London Rebuilt

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  In 1660, Hooke discovered the law of elasticity that still bears his name. He first announced it as an anagram, "ceiiinosssttuv", publishing the solution in 1678 as the Latin phrase Ut tensio, sic vis: "As the extension, so the force." Encoding discoveries in anagrams was a practice Hooke shared with Huygens and Galileo, a way to establish priority without revealing the details.

  Hooke's work on elasticity led him to develop the balance spring, or hairspring, the device that for the first time allowed a portable watch to keep accurate time. A note dated the 23rd of June 1670 in the Royal Society's journals describes a demonstration of a balance-controlled watch before the Society, which may support Hooke's claim to have conceived the idea first. Nevertheless, the Dutchman Christiaan Huygens is credited with building the first watch to actually use a balance spring, publishing his own work in the Journal de Scavans in February 1675.

  After the Great Fire of London in 1666, Hooke's skills as surveyor and draughtsman transformed his material circumstances. As Surveyor to the City of London and chief assistant to Christopher Wren, he surveyed more than half the fire-damaged property lines, work that was grueling and legally precise. According to Lisa Jardine, in the four weeks from the 4th of October he helped map the fire-damaged area, began compiling a Land Information System for London, and drafted building regulations for an Act of Parliament. Hooke's surveys made possible the production in 1677 of Ogilby and Morgan's large-scale map of London, the first known to be drawn to a specific scale of 1:1200. From 1671 to 1696, Wren's office paid Hooke £2,820 in fees for this architectural work, more than he ever earned from his positions at the Royal Society. Among the buildings Hooke designed were the Monument to the Great Fire of London in 1672, Bethlem Royal Hospital in 1674, and Ragley Hall, Warwickshire in 1680.

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• 8. The Man Behind the Reputation

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  His first biographer Richard Waller described Hooke as "in person, but despicable" and "melancholy, mistrustful, and jealous". Those words shaped how writers treated Hooke for more than two centuries. Newton's biographers in particular portrayed him as a "disgruntled, selfish, anti-social curmudgeon". The historian Arthur Berry wrote that Hooke "claimed credit for most of the scientific discoveries of the time". In October 1675, the Council of the Royal Society even considered a motion to expel Hooke because of his public attack on Christiaan Huygens over priority in watch design; the motion did not pass.

  Hooke's own biographer Ellen Drake offered a corrective: the controversies Hooke entered were characteristic of the era, and his reactions, when compared to those of some contemporaries, were relatively mild.

  The 1935 publication of Hooke's diary changed the picture more directly. His biographer Margaret concluded that the image of Hooke as a recluse was "completely false". The diary records frequent meetings at coffeehouses and taverns, dinners with Boyle, tea with his lab assistant Harry Hunt, and a close friendship with John Aubrey that lasted decades. He interacted with the clock-maker Thomas Tompion and the instrument-maker Christopher Cocks. Since childhood, Hooke had suffered from migraine, tinnitus, dizziness, and bouts of insomnia. He also had a spinal deformity consistent with Scheuermann's kyphosis, which gave him in later years what Waller described as a "thin and crooked body, over-large head and protruding eyes". He recorded his self-medication in detail: sal ammoniac, emetics, laxatives, opium. He treated his own body as a subject for experiment, as he treated everything else.

  No authenticated portrait of Hooke survives. German antiquarian Zacharias Conrad von Uffenbach visited the Royal Society in 1710 and recorded being shown portraits of "Boyle and Hoock"; Boyle's portrait is still held, Hooke's has never been found. When the Royal Society moved to new premises in 1710, a few months after Hooke's death and with Newton now president, Hooke's was the only portrait to go missing. In 2019, Larry Griffing of Texas A&M University proposed that a painting by Mary Beale, previously catalogued as Portrait of a Mathematician, may in fact be of Hooke. The debate continues.

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