DERIVATIVES FROM CHAPPE One of the main problems with Chappe’s telegraph and those that arose in the rest of Ejuropa was that the symbols represented could only be seen from the front due to the placement of the poles. And from another angle they could not be distinguished. Betancourt and Mathé made a development with an angle that allowed it to be better appreciated at an angle slightly greater than 45 degrees. All of these telegraphy systems had the disadvantage of being visible during the day. An attempt was made to light them with lanterns but it did not work. Climatic factors also affected and even interrupted communication.