The Colt Acetylene Flash Lantern (or Colt Field Signal Lamp) was an acetylene

signal lamp Signal lamp training during World War II A signal lamp (sometimes called an Aldis lamp or a Morse lamp) is a semaphore system using a visual signaling device for optical communication, typically using Morse code. The idea of flashing dots and d ...

produced by the J. B. Colt Company and used by the United States military at the start of the 1900s. A patent for the device was filed in 1902. A description from maneuvers at

Fort Riley Fort Riley is a United States Army installation located in North Central Kansas, on the Kansas River, also known as the Kaw, between Junction City and Manhattan. The Fort Riley Military Reservation covers 101,733 acres (41,170 ha) in G ...

detailed the device:

The Colt's acetylene flash lantern was employed for night signals. The flash is produced by means of a key which causes a full flame to burst forth in the lantern for the length of time the key is pressed down; when the pressure is removed the light reduces to a minute jet, not visible to the receiving station. It is carried in three leather cases, one holding the tripod, one the generator, and the third the flash lantern, reading lamp, and remaining parts. It is assembled on an extension tripod, with the flash lantern on top, the generator attached to the legs beneath the lantern, and the reading lamp is placed on one leg near the lantern. The signals can be seen up to thirty miles with an ordinary field glass.

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