Lighthouses in the fog | Acoustic signal technology (part 1)

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In this chapter we are going to talk about the evolution of the acoustic signals that lighthouses and buoys have used to aid navigation: cannons, bells and the steam whistle.
Also on Twitter @ExoCoordenadas / exocoordenadas
Drawings: Vecteezy.com
Music: Vacation - AShamaluevMusic, Airborne - Quincas Moreira