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This passage gives the first indication of the use of a special call for the telegraph. The same year , in a work entitled Versuch ueber Telegraphie und Telegraphen, Boeckmann likewise proposed the use of the pistol as a call signal, in conjunction with the use of a line composed of two wires only, and of discharges in the air or a vacuum, grouped in such a way as to form an alphabet.
Experiments like those indicated by Boeckmann, however, seem to have been made previous to 1794, or at that epoch, at least, by Cavallo, since the latter describes them in a Treatise on Electricity written in English, and a French translation of which was published in 1795. In these experiments the length of the wires reached 250 English feet.
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