Heliographs are devices that use sunlight to transmit messages over long distances. They were first developed in the early 19th century and were used extensively for communication in the military, particularly during the Indian Wars in the United States. Heliographs work by reflecting sunlight off of a mirror and using a code to transmit messages using flashes of light. The use of heliographs was particularly important in areas where traditional forms of communication, such as telegraphs, were not available. They were also useful in situations where traditional communication methods were not secure, as the flashes of light could not be intercepted by the enemy. Heliographs were often used in conjunction with other forms of communication, such as mounted couriers, to ensure that messages were delivered quickly and reliably. Heliographs were widely used during the late 19th and early 20th centuries, but their use declined with the advent of more advanced communication technologies, such as radios and telephones. However, they are still used in some areas today, particularly in remote locations where other forms of communication are not available.
sunlight, communication, military, Indian Wars, mirror
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