Page 259 - The Secret War in the Italian front in WWI (1915-1918)

CHAPTER ELEVEN

11.17 Cover and one page of the C5 Code for aircrafts (ISCAG Library)

a new coMMunIcaTIon Mean: geoTelegraPhy

To connect the most forward posts to their
Commands, a new French communication
system known as Télégraphie Par le Sol, or TPS
or also as geo-telegraphy, found application on
the Italian front in 1917 .
83
A geo-telegraphic transmitter included: a wire
between 50 and 100 metres long grounded at both
ends and simply laid on the terrain, a transmitting
11.18 Bases of a geo-telegraphic connection device including an acoustic frequency vibrator
called ‘parleur’, a battery, and a telegraph key.
The receiving station contained a wire of an equal or larger length than in the transmission terminal,
also grounded at both ends, and an acoustic frequency amplifier to which the operator’s headset was
connected. The transmitting and receiving wires were called ‘bases’ (picture 11.18).

83 Geo-telegraphy was tested at the end of 1915 on the initiative of General Gustave August Ferri, head of the French military
Radiotelegraphy Service. It was perfected during the following year and then used by the Allied and enemy armies. (La T.P.S.,
La Nature, Revue de Sciences et de leurs Applications, Paris, 46 Année deuxième semestre 1918 - premier semestre 1919).
ème

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