Machine used carbon dating
Indeed, heavy reliance on calligraphy continued in offices for decades after the first practical typewriter was marketed by Remington in 1874.Until the late 18 century, if an office wanted to keep a copy of an outgoing letter, a clerk had to write out the copy by hand.In that case, he (copying clerks were men) would insert a sheet of oiled paper into the copying book in front of the first tissue on which he wanted to make a copy of a letter.He would then turn 20 sheets of tissue paper and insert a second oiled paper.This technology continued to be important through most of the nineteenth century.
Copying Clerks Before the 20th century, correspondence was principally by hand with pen and ink.Prior to the introduction of inks made with aniline dyes, the quality of copies made on letter copying presses was limited by the properties of the available copying inks.The first aniline dye was invented in 1856, and numerous aniline dyes were invented in the following two decades. 193) reports that "The growth of the aniline dye and ink manufacturing industries in Germany, which coincided with the earliest importation in 1868 of thin papers manufactured in Japan, brought a new popularity to the bound letter book." Some documents that were to be copied with copying presses were written with copying pencils rather than copying ink.Offices need more than one copy of a document in a number of situations.Typically they need a copy of outgoing correspondence for their records.