3 ms·

These were two distinct networks, the other network was run by the PTT : https://fr.m.wikipedia.org/wiki/Poste_pneumatique_de_Paris https://fr.m.wikipedia.org/w

• _int3_ 4y ago
  "Citywide compressed air energy systems have been built since 1870.[23] Cities such as Paris, France; Birmingham, England; Dresden, Rixdorf and Offenbach, Germany and Buenos Aires, Argentina installed such systems. Victor Popp constructed the first systems to power clocks by sending a pulse of air every minute to change their pointer arms. They quickly evolved to deliver power to homes and industries.[24] As of 1896, the Paris system had 2.2 MW of generation distributed at 550 kPa in 50 km of air pipes for motors in light and heavy industry. Usage was measured by cubic meters.[23] The systems were the main source of house-delivered energy in those days and also powered the machines of dentists, seamstresses, printing facilities and bakeries." [1] [1] https://en.wikipedia.org/wiki/Compressed-air_energy_storage https://en.wikipedia.org/wiki/Compressed-air_energy_storage