Sir Isaac Newton – Master of the Mint

Newton in 1702

In 1699, Isaac Newton was ready for a new challenge. It had taken months for the Warden of the Mint to build a watertight case to prosecute the most notorious counterfeiter in the land. His forensic analysis of the evidence and dogged determination to get his man had paid off. In March, Newton’s nemesis, William Chaloner, made a one way trip to the gallows at Tyburn to suffer the ultimate penalty for his crimes.

Pursuing and prosecuting criminals wasn’t a task that Newton particularly relished. Still, when he was told that it was part of his job description, he applied the same scientific rigour to his criminal investigations that he had applied to his theorems. In doing so, he became arguably London’s first undercover detective.

On 17th December 1699, the Master of the Mint Thomas Neale died, and Newton was offered the role. He accepted it on Christmas Day 1699, his 57th birthday. Though technically less senior than the Warden, it was a more lucrative post because the Master acted as a contractor to the Crown and profited from the rates at which work was put out to sub-contractors. Newton was to remain Master for the Mint until his death twenty-seven years later.

Once again, Newton threw himself into his new role, working diligently and with great integrity to improve the reputation of the Mint, which had been dogged for decades by accusations of corruption and incompetence. At a time when corruption was widespread, he set himself up as a role model for his employees to follow, as evidenced when he refused a bribe of over £6000 to award contracts for the procurement of copper.

Newton was determined to use the new minting technology available to him to create the best possible visual appearance of coins. He hired a skilled German jeweller from Dresden named John Croker to engrave designs onto the dies at a greater depth. The resulting die would then be used to strike coins in high relief, which would make the monarch’s portrait look more lifelike. The deeply engraved Two Guinea and Five Guinea pieces that were struck in 1701 are known today as the “fine work” Guineas. They are a testimony to Newton’s determination to produce the best possible coinage and have rightly become numismatic classics.

The ‘Fine Work’ Five Guinea

In April 1705, Queen Anne knighted Newton during a royal visit to Trinity College, Cambridge. The knighthood is likely to have been motivated by political considerations rather than recognition of his scientific discoveries or services as Master of the Mint. Nonetheless, Newton became only the second scientist to be knighted after Sir Francis Bacon.

Sir Isaac took his responsibilities as Master of the Mint very seriously and maintained an active involvement in its day-to-day affairs even into old age. The administrative skill he brought to the role is demonstrated in the hundreds of surviving reports and letters he wrote as Master. One of his most famous reports, issued in September 1717 to the Lords Commissioners of His Majesty’s Treasury, established a new mint ratio between silver and gold that had the effect of moving Britain onto the gold standard.

With silver coinage in such short supply, there was an urgent need to issue a lower denomination gold coin. In 1718 it was decided to strike a gold quarter guinea worth approximately the same as the five-shilling silver Crown. The new coin weighed 2.1 grams and was just 16 millimetres in diameter. Newton did not appreciate that such a small coin would be impractical to use, which made them unpopular. Of the 37,380 coins minted, many were put aside as keepsakes due to their beautifully intricate design. Production of the quarter guinea ceased within a year, and an increased number of guineas and half guineas were made instead.

The short lived Quarter Guinea, beautiful but too small for practical use

Newton was particularly concerned with the accuracy of the currency. He was determined to ensure that all coins were made to the correct weight and fineness, varying as little as possible. This level of accuracy was unprecedented. It is arguably one of his most outstanding achievements as Master of The Mint that he brought the coinage, in his own words, to a “much greater degree of exactness than was ever known before”.

Given his undisputed commitment to accuracy in every aspect of his work, it is hardly a surprise that Newton reacted furiously in 1710 at the judgement of the Trial of the Pyx, who ruled that his gold coins were below standard. Trials have been held in London on an annual basis from the Twelfth Century to the present day and are presided over by a judge with an expert jury of assayers. Their purpose is to test randomly selected newly minted coins to ensure that they are within the statutory limits for metallic composition, weight and size.

On this particular occasion, Newton was so adamant that his coins had been manufactured to the correct weight and finesse that the gold trial plate used by the assayers to evaluate the coins was itself evaluated and found to be below the legal standard. The coins themselves were perfect.

Knowing the penalty for failing the Trial of the Pyx makes Newton’s unwillingness to admit error quite understandable. It was more than professional pride. As Master of the Mint, he could be held directly accountable for any coins that failed the trial. Punishment ranged from imprisonment to hanging and quartering!

Despite his great ability with numbers and mathematical calculations, Newton still lost a fortune on the stock market. In 1720 he invested heavily in the South Sea Company, established in the early Eighteenth Century, which had a monopoly on trade in the South Seas. Newton initially purchased and sold a small number of shares and made an impressive profit. As he watched stock in the company continue to climb, Newton bought more shares, eventually pouring almost his entire life savings into the company. Then, he watched in horror as the bubble burst. According to his niece, he lost around £20,000 and is said to have remarked ruefully at the time, “I can calculate the movement of stars, but not the madness of men.”

Newton never married, and his chronic insecurity, bouts of depression and preoccupation with his work meant that few friends came to visit. Towards the end of his life, he lived near Winchester with his niece Catherine (Barton) Conduitt and her husband John. When asked, shortly before his death, how he would describe his achievements, he replied;

“I do not know what I may appear to the world; but to myself I seem to have been only like a boy playing on the seashore, and diverting myself now and then in finding a smoother pebble or prettier shell than ordinary, while the great ocean of truth lay all undiscovered before me.”

Sir Isaac Newton died on 31st March 1727, at the age of 84 and is buried at Westminster Abbey.

Given his lengthy association with coinage, it was inevitable that Newton would eventually be commemorated on one. Sixty years after his death, a severe shortage of farthings, half-pennies and pennies for everyday trade led to many private businesses taking matters into their own hands and minting large numbers of copper tokens. Workers were paid in tokens and would exchange them locally for goods and services in company-owned shops. By the end of the Eighteenth Century, millions of tokens had been struck and were in everyday use throughout Great Britain.

Half-penny copper token depicting Newton in 1793

In 1793, copper farthings and half-penny tokens featuring Newton on the obverse proved very popular. The reverse depicted a horn of plenty (cornucopia), a symbol of abundance that honours his outstanding contribution to science, astronomy and mathematics. The half-penny is larger, and in addition to the cornucopia also depicts the Caduceus, the staff carried by Hermes, the winged messenger of the Gods. This is a symbol of communication, writing, printing, eloquence, enlightenment and understanding. The inclusion of the symbols made the Newton tokens very popular, not least because they were believed to grant prosperity and eloquence to anyone who owned them

Nearly two hundred years later in 1978, the Bank of England honoured Sir Isaac Newton on the reverse of the one-pound note. The design, by Harry Eccleston, featured the Caduceus and cornucopia adjacent to Queen Elizabeth II on the front. The reverse depicted Newton holding an open book seated next to a prism and a reflecting telescope. Behind him is the heliocentric solar system, reflecting the enormous impact that his single-minded determination to uncover the secrets of the universe has had on the ongoing development of humanity.

Newton appeared on the British one pound banknote from 1978 to 1988

In 2017, The Royal Mint commemorated the life of their most famous Mint Master with a fifty pence coin that borrowed the design of the solar system that had featured on the old banknote. The Government of Gibraltar also issued a commemorative Quarter Guinea and Five Guinea in the same year to honour Newton’s ‘fine work’. The new design incorporated the cornucopia and the Caduceus, together with an apple, which Newton famously credited with helping him develop the theory of gravity after watching one fall from a tree outside his home.

Commemorative gold Five Guineas issued by Gibraltar in 2017

Sir Isaac Newton – Warden of the Mint

Isaac Newton, pictured in 1689

In 1693, fifty-one-old Isaac Newton was mentally exhausted. After firmly rejecting a career in the family farming business as a young man, he had instead written the laws of motion, explained orbital mechanics, investigated the principles of light and colour and developed the calculus. His place in history as one of the greatest thinkers of the modern age was assured.

Newton had grown bored with his sedentary life as a Professor at Cambridge University. The man who had once pushed a bodkin into his eye to test his theories about colour now found that the scientific pursuit of truth no longer held the appeal it once did. His finest achievements were, he felt, behind him, and his behaviour had become increasingly unpredictable and erratic. He would fly into furious rages and write angry, vengeful letters to former friends accusing them of betrayal and conspiracy at the slightest provocation. Plagued by depression, paranoia and insomnia, he suffered what he would later describe as his ‘black year’. It would last eighteen months.

Newton needed a change of scene and a new challenge to exercise his mind. After a while, he began to bombard his friend Charles Montagu, Chancellor of the Exchequer, with letters requesting work in London. Eventually, on 19th March 1696, he received a reply, notifying him that he had been recommended for the position of Warden of the Royal Mint. Newton eagerly accepted and had reported for duty within the month.

Based at the Tower of London where the Mint made the coins of the realm, the Warden’s job was to enforce laws against counterfeiting. The office had been viewed as a largely symbolic position that required little work. However, Newton took the role extremely seriously and relished the challenge. Whether Montague intended it that way or not, his decision to allow Newton to apply his scientific methodology and towering intellect to the currency crisis was to prove an inspired one.

The Tower of London, pictured in 1737

Counterfeiting was a thriving industry in Britain when Newton arrived at the Tower of London to take up his new position. Around ten per cent of coins in circulation were fakes, cast or stamped from forged or stolen moulds and dies. In addition, the value of silver on the continent was greater than its face value on coins. As a result, huge numbers of silver coins were withdrawn from circulation, melted and taken abroad to be sold at a tidy profit. Genuine coins were often hoarded, thus proving Gresham’s law that “bad money drives out good”.

Counterfeiters would clip metal from coins (left) and use the clippings to make new coins (right).
Some counterfeit coins, such as those produced by William Chaloner, were of exceptionally high quality

Newton’s solution to the problem involved a Great Recoinage. This enormous operation involved taking in millions of pounds of coins by weight and re-minting them at their correct value. He organised a production line of 500 men at the Tower of London, and over the next four years, they smelted most of England’s money supply. To assist them, branch mints were established at Bristol, Chester, Exeter, Norwich, and York. Knowing that some counterfeiters had access to stolen Royal Mint equipment, Newton told the officers at these country mints to “trust not the computations of a single Clerk nor any other eyes than your own.”

On Newton’s orders, Mint employees worked six days a week from 4 a.m. to midnight. Before he arrived, no one thought the Mint could produce 15,000 coins in a week. Newton soon had them turning out 50,000 coins every week, and between 1696 and 1699, the value of silver struck was over £5.1 million, compared to £3.3million coined in the preceding 35 years.

Newton’s position as Warden of the Mint also meant that it was his responsibility to track down and prosecute counterfeiters. Chasing crooks was not something that particularly appealed to him, and he wrote a letter to the Treasury asking if he could be excused this particular duty. They reminded him that it was part of his job description, and so he set to work with his customary zeal and single-minded determination. To assist him, Parliament passed the Coin Act in 1696, making it an act of treason to make coins, construct, sell or possess the equipment required to make coins or assist anyone making coins. The punishment for doing so was death.

Newton was now able to devote more time to his primary duty of investigating and bringing to justice the counterfeiters and clippers. He went undercover himself and visited notorious bars, taverns and other dens of iniquity in London where criminals gathered to recruit informants and purchase information.

Newton went to bars and taverns gather evidence

Newton hired private “thief-takers” to locate counterfeiters and their equipment. Records show that he personally tracked criminals to their lairs and interrogated them in person. He became a regular visitor at the rat-infested Newgate Prison, where he conducted more than 58 interviews. Between June 1698 and December 1699, he conducted more than 100 cross-examinations of witnesses, informers, and suspects to build watertight cases against the accused. Newton gathered evidence to successfully prosecute 28 counterfeiters, most of whom went to the gallows and paid the ultimate penalty for their crimes

However, Newton’s biggest challenge was to prosecute the most prolific counterfeiter of the age. It took Newton many months to build a successful case against this kingpin of the criminal underworld, and soon he was working full time on this one goal. Like Sherlock Holmes and Moriarty, every great detective needs a worthy adversary. Newton’s was a man called William Chaloner, a resourceful and cunning counterfeiter of exceptional ability with ambitions to run The Royal Mint.

Chaloner was born in poverty, the son of a weaver in Lincolnshire. He ran away to London as a young man and started at the very bottom of the criminal ladder, hawking and scamming unwary passers-by on street corners. He possessed an enquiring mind and the gift of the gab and sometimes pretended to be a doctor to sell remedies for imaginary ailments that he would diagnose on the spot.

To provide a legitimate front for his business dealings, Chaloner set himself up as a recoverer of stolen property. Of course, he was able to do this because he had arranged for the property to be stolen in the first place. He also had a brief career informing on enemies of the state, paying Jacobites to print dissident literature and then betraying them to the authorities and pocketing the reward money. Eventually, his luck ran out, and he was named a suspect in a burglary case in 1690, which forced him to flee and go into hiding.

It was a chance meeting with a craftsman who showed him how to gild surfaces that made Chaloner’s fortune but ultimately took him to the gallows. He quickly realised the potential for counterfeiting gold and silver money, and over a lucrative eight-year career, he is believed to have counterfeited over £30,000 worth of currency.

Counterfeiting made Chaloner a very wealthy man. He bought a large house in the semi-rural suburb of Knightsbridge, rode in a carriage, wore fine clothes and presented himself to high society as a gentleman. After forging “Birmingham Groats”, he moved on to more lucrative Guineas, French Pistoles, crowns and half-crowns, Banknotes and lottery tickets

Chaloner developed a sophisticated casting method that involved pouring molten metal into high-quality brass moulds and set up a factory in Egham 20 miles outside London. It was said that he was so pleased with the quality of the counterfeits he was producing that it upset him to see them used as it spoiled their perfection!

Chancellor of the Exchequer, Charles Montagu, who appointed Newton the Warden of the Mint

Ultimately, Chaloner’s giant ego was his undoing. A few months before Newton took up his post, Chaloner had written to the Government claiming to have evidence that men working at the Mint were selling duplicates of the casts used to make coins. Of course, he didn’t tell them that he only knew this because he had purchased one of these casts for himself! When Newton heard of the letter, he immediately launched an investigation and interviewed more than 30 suspects to determine whether there was any truth in the accusations. Meanwhile, Chaloner tried to involve himself in the investigation and revealed his real purpose for writing the letter. He wanted Parliament to let him run the Royal Mint to sort out the mess!

Chaloner wrote letters, published pamphlets and was even invited to appear before Parliamentary committees, arguing that only he could solve England’s counterfeiting problem. He even went so far as to publicly accuse Newton of incompetence and possibly even fraud in managing the Great Recoinage. Newton was furious at this slur on his reputation, and so began a game of cat-and-mouse in which Chaloner sought to persuade Parliament to give him control of the Mint while Newton secretly compiled evidence to expose him as the chief counterfeiter in England.

Newton discovered that Chaloner had been arrested repeatedly for various scams and had even served time in jail for petty offences. However, because there were no centralised criminal records at the time, it had been easy for him to move from place to place and start again each time he was released. Astonishingly, Newton discovered that in 1694, Chaloner had been caught red-handed in the act of forging banknotes. He had talked his way out of prosecution on that occasion by naming people who he claimed were the real counterfeiters behind the operation. He even ended up receiving a reward for his information!

Much to Newton’s frustration, in 1697, Parliament ordered him to provide Chaloner with the resources to make prototypes of a new currency that he had proposed to them. Newton refused, so Chaloner went ahead and made them anyway using stolen casts. When Newton found out through his informer network, he immediately had Chaloner arrested. Chaloner quickly paid a key witness to flee to Scotland, and without him, the case against him collapsed. Newton then went to Parliament to voice his suspicions about Chaloner, but these were dismissed, and Chaloner went back to offering his services to run the Royal Mint, whilst simultaneously producing forged £50 banknotes and lottery tickets!

After that, Newton dedicated himself solely to the task of building a robust case against Chaloner. He worked relentlessly and with a single-minded determination to gather evidence for the prosecution. He methodically bribed, threatened and bullied witnesses for information that would allow his spies and informants to infiltrate Chaloner’s sophisticated counterfeiting operation. Eventually, there was enough evidence to arrest him again, and this time Newton even arranged for informants to be locked up with him to report back on anything that he said in custody.

Newgate Prison

When the trial finally came, Newton assembled eight witnesses to testify against Chaloner, including the wife of the man he had paid to run away to Scotland. She was willing to speak in court because Chaloner had scammed them out of money as well. Such was the weight of evidence against him that the jury quickly reached their verdict and sentenced the counterfeiter to hang.

Chaloner appealed for mercy from his condemned cell in Newgate Prison and wrote to Newton several times, begging him to save his life. His final letter concluded with the piteous words; “Oh dear Sir nobody can save me but you. O God my God I shall be murdered unless you save me.” Newton did not respond.

On 22nd March 1699, there was nothing left for Newton’s great adversary to do but protest to the people who had come to watch him hang at Tyburn that “he was murder’d … under pretence of Law”. He suffered a miserable death choking for several minutes at the end of the rope, much to the amusement of the jeering crowd.

The Tyburn tree, where Chaloner met his grisly fate in 1699

It is doubtful that Newton was at Tyburn that day to witness this culmination of months of hard work. In his notebook, he wrote simply that “Chaloner could have lived a long, honest life had he let the money and Government alone.”