Telegraphy the sense of a system that can transmit arbitrary messages over arbitrary distances. Lines of signalling relay stations can send messages to any required distance, but all these systems are limited to one extent or another in the range of messages that they can send. A system like flag semaphore, with an alphabetic code, can certainly send any given message, but the system is designed for short-range communication between two persons. An engine order telegraph, used to send instructions from the bridge of a ship to the engine room, fails to meet both criteria; it has a limited distance and
Coat of arms of the Republic of Ragusa they ordered flags to be made from Venice containing the arms of Kingdom of Hungary and in 1362 they also ordered flags with Saint Blaise. According to some sources the use of the Hungarian arms depended on various foreign policy conditions and so the government of the Republic of Ragusa issued an order to all ship captains that they should not assert any other symbols except those of the Republic (with Saint Blaise) and those of the Hungarian kingdom. In Dubrovnik the coat of arms with the red and white bars became widely accepted as the arms of the Republic