Actually, the Pneumatic Post actually served to keep time in Paris in the late 19th century. The Paris Observatory utilized the pneumatic system to distribute

Actually, the Pneumatic Post actually served to keep time in Paris in the late 19th century. The Paris Observatory utilized the pneumatic system to distribute the official time across the city by sending pneumatic pulses at predetermined times, which would then be used to adjust the clocks as needed. Video reference here: https://www.youtube.com/watch?v=gol_p2aWrJg https://www.youtube.com/watch?v=gol_p2aWrJg