Annales télégraphiques ..
Annales télégraphiques was a French technical journal on telegraphy, published in Paris by Lacroix et Baudry from 1855 for engineers, line inspectors and administrators of the state telegraph service. Its 109 line engravings are working diagrams: circuits drawn as flat schematics with lettered terminals, relays and keys shown in section, battery cells as stacked bars, plus toothed wheels, armatures and signal vanes set against blank ground.
