People at the Philadelphia Stock Exchange back in colonial America had a system where when a ship landed in NYC it would have info about ships coming one or mor

People at the Philadelphia Stock Exchange back in colonial America had a system where when a ship landed in NYC it would have info about ships coming one or more days later to Philadelphia and they would semaphore the info over to high points in NJ and on down though to Philadelphia. The info would get from NYC to the exchange in 5 to 10 minutes, and insiders were able to trade at advantage with that info.