A heliograph uses a mirror to reflect sunlight to a distant observer. By moving the mirror, flashes of light can be used to send Morse Code. The heliograph was a simple but highly effective instrument for instantaneous optical communication over 80km or more in the 19th century.
A heliograph is a device for sending messages or signaling by flashing the sun's rays from a mirror.
The instrument is called a Heliograph. It reflects sunlight to a remote station and is used in signaling and surveying by reflecting and then blocking the sunlight to create flashes of light, a bit like morse code but without the sound. The communication itself is called a Heilogram. This device was used primarily by the military in the 19th and early 20th century. It was invented by Sir Henry Christopher Mance (1840-1926) of the British Army Signal Corps in 1869, and was first used in war. Amazingly, it can send messages over 100 miles.
Heliographs got their name from the Greek words "helios," meaning sun, and "grapho," meaning to write or draw. The device uses sunlight to transmit messages by reflecting sunlight through mirrors or lenses, creating flashes of light that can be seen from a distance. This method of communication was commonly used in the 19th century, particularly in military and surveying applications.
A signalling device, sunlight is reflected in flashes from a movable mirror. Or it can be a telescopic apparatus for photographing the sun Or an instrument for recording the duration and intensity of sunshine
no it cannot
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A heliostat is a device that uses mirrors to track the movement of the sun and reflect sunlight onto a specific target, such as a solar panel or a building. It is commonly used in solar energy systems to maximize the amount of sunlight that can be captured and converted into usable energy.
pager
A signaling device.
That device is a telescope.
The periscope, and I believe they have a lot more than 2 mirrors.
Convex Mirror