This incomplete mechanism comprises three parts: transmitter, receiver, and printer. Letters are transmitted by means of a sliding switch (missing), which engages into the notches of a curved contact strip. The letters are indicated on another strip. The receiver has two windows: the upper one shows the letters engraved on a large brass dial; the lower one is a slit from which emerges the ribbon on which the message is printed. The complicated mechanism is operated by two large horseshoe electromagnets: the left-hand one energizes the receiver, the right-hand one the printer. The latter works in the following manner. A series of lead type-font letters was arranged along the edge of the dial. The letters were inked from a small container. As a letter was displayed on the dial, the corresponding one on the rim was struck by a small hammer from below, leaving its impression on the paper ribbon, which was automatically advanced one space. Lorenzo Turchini presented his "Teletipographia elettro-magnetica" to the Third Congress of Italian Scientists in Florence in 1841. Probably a prototype that was never developed. Provenance: Lorraine collections.