Here is a description from the 1899 patent on how it managed to be used as a cypher machine. “The present invention relates to type-writing machines which can be used for code or secret writing. The invention consists in the arrangement horizontally of two concentric rings, one within the other, each being provided on its surface with letters and signs, which rings can be relatively displaced one with regard to the other according to a prearranged code or system.”
So the sender and receiver offset the inner index on their Diskret machines by the same amount by rotating it against the outer stationary index. Then one types using the inner index, scrambling the typed message as the characters on the outer index are typed. To read the cyphered message one looks for the characters in the cypher, one by one, on the outer index and then looks at the paired character on the inner index. One is not able to directly type out the uncoded message but one could write the message out on a piece of paper.
To type one simply selects the characters with the rotatable central handle and then one pushes the lever down on the left hand side of the wooden base which causes the carriage assembly, with the vertical typewheel, to descend and print on the paper. Inking is achieved with two ink rollers.
The Diskret is lavishly adorned with cast Art Nouveau motifs. In Germany the Art Nouveau movement was called Jugendstil (youth – style) and combined floral ornaments and flowing lines. The members of the movement were reacting against the neo- classicism of the official art and architecture. Art Nouveau artists sought to integrate art with the everyday, producing beautiful objects to elevate people’s lives. With these Jugendstil decorations adorning the Diskret, the Diskret is elevated to an exceptional object of functionality and art.
Production and serial numbers: The Volkschreibmaschine (Peoples typewriter) of 1888 was the predecessor of the Diskret and was produced in Karlsruhe, Germany along with the first Diskets. The Volkschreibmaschine only had one index and was not able to create a cyphered message. It seems that the serial numbers for these two typewriters ran consecutively and then started again when production moved to Berlin and then Leipzig with the firm Giernat & Schroter. The Diskrets made in Berlin and Leipzig have an impressive decal on the inner index plate while the Karlsruhe Diskrets did not.