general service code การใช้

• Myer's " General Service Code " for wig-wag signaling, standardized in 1864, was also known as the " four element " code because all of the characters transmitted were composed of from one to four flag motions . ( Myer's original method from the 1850s was called a " two element code " because elements were described only in terms of movement from the vertical position . ) The flagman took a position facing the station to receive the message and signaled digits " 1 " through " 5 " as follows: