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Unlike a spirit duplicator master, a hectograph master is not a mirror image. Thus, when using a spirit duplicator master with a hectograph, one writes on the back of the purple sheet, using it like carbon paper to produce an image on the white sheet, rather than writing on the front of the white sheet to produce a mirror image on its back.
A spirit duplicator (also referred to as a Rexograph or Ditto machine in North America, Banda machine or Fordigraph machine in the U.K. and Australia) is a printing method invented in 1923 by Wilhelm Ritzerfeld that was commonly used for much of the rest of the 20th century. The term "spirit duplicator" refers to the alcohols that were a major ...
The hectograph introduced in 1876 or shortly before, was a technology in which a dye-impregnated master copy, not unlike a spirit master, was laid on top of a cake pan full of firm gelatin. After the dye soaked into the gelatin, sheets of paper could be laid on top of the gelatin to transfer the image.
Unlike spirit duplicators (where the only ink available is depleted from the master image), mimeograph technology works by forcing a replenishable supply of ink through the stencil master. In theory, the mimeography process could be continued indefinitely, especially if a durable stencil master were used (e.g. a thin metal foil).
The Sinclair ZX Printer, a small spark printer for the ZX81 and ZX Spectrum computers. Spark printing is an obsolete form of computer printing and before that fax and chart recorder printing which uses a special paper coated with a conductive layer over a contrasting backing, originally black carbon over white paper but later aluminium over black paper.
A report on proposed changes to U.S. dietary guidelines suggests encouraging people to eat more beans and lentils for protein and less red meat. Updated guidelines are expected to go into effect ...
We tested out the ReMarkable tablet to see if it really can replace paper notebooks like the brand says. Here's what we thought.
Solid ink (also known as hot melt ink [1] [2]) is a type of ink used in printing. Solid ink is a waxy, resin-based polymer that must be melted prior to usage, unlike conventional liquid inks. Solid ink is a waxy, resin-based polymer that must be melted prior to usage, unlike conventional liquid inks.