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.
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
dsadsad
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
They didn't have mirrors as such, they just polished up bits of metal really well which they then used as a reflective device.