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Support Our Channel : This 1960s instructional film shows how to use an early kind of photocopy machine called a spirit duplicator. The film also shows a photocopy machine (1:20), an offset duplicator (1:25), and a stencil duplicator (1:44). At 1:49 a spirit duplicator is shown. At 2:00 the narrator mentions the name Ditto, as that company was once prominent in the field. The dye transfer process is then explained. A spirit duplicator (also referred to as a Ditto machine in North America, Banda machine in the UK or Roneo in Australia, France and South Africa) was a printing method invented in 1923 by Wilhelm Ritzerfeld and commonly used for much of the rest of the 20th century. The term “spirit duplicator“ refers to the alcohols which were a major component of the solvents used as “inks“ in these machines.[1][2][3] The device coexisted alongside the mimeograph. Spirit duplicators were used mainly by schools, churches, clubs, and o
