Synthesized answer
The provided passages do not contain information about the practical implications of the electric telegraph. The only information given is the title of the work and the author's name [26]. Therefore, it is not possible to answer the question regarding practical implications based on the provided text.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: “Der” elektrische Telegraph als deutsche Erfindung Samuel Thomas von Soemmerring's by Samuel Thomas “von” Sömmerring Pages: 26