In 1780, a Scottish inventor created a copier hundreds of years before modern-day equipment came into existence: How James Watt machine worked?

In 1780, a Scottish inventor created a copier hundreds of years before modern-day equipment came into existence. James Watt, who is known for his work on steam engines, also developed a method for copying written letters. He patented a letter copying press in 1780. The device did not work like a modern photocopier. Instead, it used pressure to transfer wet ink from an original page to a thin sheet. The copied writing appeared in reverse and could be read through the sheet from the other side. The invention was developed to help people keep copies of letters without writing them again.

How James Watt's 1780 copier worked?

The letter copying press used two sheets of paper and a pressing mechanism. A person first wrote a letter using ink that was suitable for the copying process. The original letter was then placed against a thin sheet of paper. Pressure was applied with the copying press.

The ink moved from the original page onto the second sheet. The writing appeared in reverse on the copy. The thin paper was important because the copied writing could be read from the other side. This allowed the person to read the text in the correct direction. The process was different from modern photocopying. There was no electricity, scanner, toner or digital file. The machine relied on physical pressure and the transfer of ink.


Watt and his colleagues tested different types of paper, inks and wetting methods while developing the process. The Powerhouse Collection records that Watt designed both a larger machine for office use and a smaller portable version for use at home or during travel.

Why the letter copying press was needed?

Writing letters was a manual process in the 18th century. If a person wanted to keep a record of a letter, another copy generally had to be prepared separately. This created a problem for people who sent many letters.

Watt and his business partner Matthew Boulton wanted to keep copies of correspondence sent to clients and people involved in science and engineering. The copying press provided a way to create a record without producing a second handwritten letter.

The machine therefore had a practical purpose. It was not designed as a general-purpose office photocopier in the way modern machines are used. It was mainly intended for copying correspondence. The Powerhouse Collection says the copying press was patented by Watt in 1780 and produced by James Watt and Co at the Soho Works in Birmingham.

From handwritten letters to copied documents

The invention changed the process of keeping written records. A person could write an original letter and then make a copy using the press. This meant that correspondence could be stored for future reference.

The copying process could also be performed after the original letter had been written. Historical descriptions of letter copying presses explain that copies could be made for some time after the original was produced, although copies made within a few hours were generally more effective.

This made the machine useful for businesses and individuals who needed records of their correspondence. The technology was also associated with well-known users. Historical accounts state that people including Benjamin Franklin, George Washington, Henry Cavendish and Thomas Jefferson used Watt copying presses during the early years of the technology.

James Watt was more than a steam engine inventor

James Watt was born on January 19, 1736, in Greenock, Renfrewshire, Scotland. His father, also named James Watt, was involved in shipbuilding, house building and business. Watt spent part of his childhood learning at home from his mother. He later attended grammar school, where he studied Latin, Greek and mathematics.

His father's workshops played an important role in his education. Watt had access to tools, a workbench and a forge. He made models and became familiar with instruments used on ships.

At the age of 17, Watt decided to become a maker of mathematical instruments. He went to Glasgow and later travelled to London in 1755 to receive training. His health became poor during his time in London, and he returned to Glasgow after about a year. However, he had gained enough knowledge to work as an instrument maker.

In 1757, Watt opened a workshop at the University of Glasgow. He made instruments such as quadrants, compasses and scales. His work at the university brought him into contact with scientists. One of them was Joseph Black, a chemist and physicist who became Watt's friend and helped influence his scientific work.

Watt's connection with the Industrial Revolution

James Watt became known around the world for his work on steam engines. In 1767, after working on a model of a Newcomen steam engine, Watt identified ways in which the machine was wasting steam. He developed a separate condenser that allowed steam to be condensed without repeatedly cooling the main cylinder.

This improvement helped increase the efficiency of steam engines. Watt later entered a business partnership with Matthew Boulton. Their company produced steam engines and became associated with the industrial changes of the period.

The Science Museum Group describes Watt as an engineer, scientist and inventor whose improvements to steam engine technology increased efficiency and reduced the cost of running steam engines. His work on steam engines became connected with the Industrial Revolution, but the letter copying press shows that his inventions were not limited to steam technology.

Watt's family and personal life

Watt married his cousin Margaret Miller in 1764. The couple had six children before Margaret died nine years later. His life involved both scientific work and business. His workshops and later partnership with Boulton gave him opportunities to develop and manufacture inventions.

Watt continued working on different inventions during his life. The Science Museum Group records that these included a method for measuring distances by telescope, improvements to oil lamps, a steam mangle, a machine for copying sculptures and a device for copying letters.

What happened to the copying machine?

The letter copying press became part of office and correspondence practices during the late 18th and 19th centuries. It was not a photocopier in the modern sense. It did not reproduce a page using light or electronic scanning. Instead, it transferred ink from one sheet to another.

The technology was useful because it addressed a specific problem: keeping a duplicate of a handwritten letter. The invention also demonstrates how copying technology developed long before modern office machines. The basic purpose was similar to later copying equipment, but the method was different. Modern copiers eventually used photographic, electrical and digital processes. Watt's machine relied on paper, ink and mechanical pressure.

Why James Watt's copier matters today?

The 1780 copying press is part of the history of document reproduction. People now copy documents with printers, scanners, smartphones and multifunction office machines. Digital files can also be duplicated instantly. In Watt's time, copying required a physical process. His invention provided a way to create a duplicate record of correspondence without writing the entire document again.

The machine also reflects Watt's approach to invention. He worked on practical problems and developed mechanical solutions. His interests extended from instruments and steam engines to methods of copying documents. The surviving examples of Watt copying presses also provide information about how people managed written communication before modern office technology.

James Watt life at a glance

• James Watt was born on January 19, 1736, in Greenock, Scotland.
• He trained as a mathematical-instrument maker.
• He opened a workshop at the University of Glasgow in 1757.
• He worked on improvements to steam engine technology.
• He developed a letter copying press.
• Watt patented the copying press in 1780.
• The machine was produced by James Watt and Co at the Soho Works in Birmingham.
• It used pressure to transfer ink from an original letter to a thin sheet.
• The copied writing appeared in reverse.
• The thin sheet allowed the writing to be read from the other side.
• Watt developed the machine partly to keep copies of letters.
• Larger machines were designed for offices.
• Smaller versions were made for home use and travel.
• The copying press was different from a modern photocopier.
• Watt continued to work on inventions beyond steam engines.
• He died on August 25, 1819, in Birmingham.