Duplicating machine

Duplicating machines were the predecessors of modern document-reproduction technology. They have now been replaced by digital duplicators, scanners, laser printers and , but for many years they were the primary means of reproducing documents for limited-run distribution.

Like the typewriter, these machines were products of the second phase of the industrial revolution which started near the end of the 19th century (also called the Second Industrial Revolution)This second phase brought to mass markets technologies like the small electric motors and the products of industrial chemistry without which the duplicating machines would not have been economical. By bringing greatly increased quantities of paperwork to daily life, the duplicating machine and the typewriter gradually changed the forms of the office desk and transformed the nature of office work.

They were often used in schools, churches, and small organizations, where revolutionarily economical copying was in demand for the production of newsletters and worksheets. Self-publishers also used these machines to produce fanzines.

A few alternatives to hand copying were invented between the mid-17th century and the late 18th century, but none had a significant impact in offices.

(these were called Pantograph Machines, Polygraph Machines are commonly called "Lie Detectors")

Polygraphs are mechanical devices that move a second pen parallel to one held by a writer, enabling the writer to make a duplicate of a document as it is written. Polygraphs appeared in the 17th century but did not become popular until 1800. Hawkins & Peale patented a polygraph in the US in 1803, and beginning in 1804 Thomas Jefferson collaborated with them in working on improvements in the machine. He used a polygraph for the rest of his life. However, polygraphs were not practical for most office purposes and were never widely used in businesses. Hawkins & Peale lost money producing polygraphs. The problem was their "inherent instability, and constant need for repair and adjustment."

In 1780 James Watt obtained a patent for letter copying presses, which James Watt & Co. produced beginning in that year. Letter copying presses were used by the early 1780s by the likes of Benjamin Franklin, George Washington, and Thomas Jefferson. In 1785, Jefferson was using both stationary and portable presses made by James Watt & Co.

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