Rotary Duplicators

Rotary Duplicators

Rotary duplicators, also known as mimeographs, are machines used for producing multiple copies of printed or written material. They were widely used in offices, schools, and other institutions before the advent of photocopiers and digital printing. The machine consists of a rotating drum or cylinder, which is coated with a waxy substance that is sensitive to pressure. The original document is placed face down on the drum, and pressure is applied to transfer the ink from the original onto the drum. The drum then rotates, and paper is fed through the machine, coming into contact with the inked drum and transferring the image onto the paper. Rotary duplicators were popular because they were relatively cheap and easy to use. They could produce large quantities of copies quickly and efficiently, and the ink was relatively inexpensive. However, they did have some drawbacks. The copies produced were not always of the highest quality, and the ink could smudge easily. Additionally, the machines required regular maintenance and cleaning to keep them in good working order. Despite their limitations, rotary duplicators played an important role in the development of printing technology. They paved the way for the photocopiers and digital printers that we use today, and they remain an important part of printing history.

printing, technology, mimeograph, ink, cylinder

— Nicholas Gray