Do pneumatic post networks strike anyone here as being built after electrical telegraphy had become established?
These systems did depend on the use of the technology behind the electrical telegraph so that the sender can tell the receiver that something is on its way and the receiver can tell the sender when it is received. But there seems to be no reason why it could not have appeared before, say, the Morse telegraph was established.
These systems did depend on the use of the technology behind the electrical telegraph so that the sender can tell the receiver that something is on its way and the receiver can tell the sender when it is received. But there seems to be no reason why it could not have appeared before, say, the Morse telegraph was established.