Night-signaling

An important branch of signaling. It may be effected in various ways. In ordinary service two torches are used,—one on the ground and the other attached to a staff, which is used precisely as the flag for day signals. Lanterns held in the hands can also be used. For long distances and when stations cannot be seen on account of intervening obstacles, such as woods, signal-rockets, candle-bombs, and other pyrotechnic devices are used.