"Tous ceux qui se sont occupés de l'application pratique de la télégraphie électrique s'accordent facilement sur ce point, savoir, que l'immense majorité des perturbations sont sujets aux télégraphes électriques proviennent des variations dans l'intensité des courants employés. La cause des variations réside, soit dans la source des courants, soit dans les conditions variables du circuit conducteur. La première de ces causes peut être éliminée en faisant usage de sources constantes. Je me contente d'observer à cet égard que je donne la préférence à la pile de Daniell."
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Electrical telegraph
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