When was the first semaphore installed ?

The word semaphore, the first was compiled as a coin, 1801. French inventor Chape, who invented the semaphore line.

During 1790-1795. At the height of the French Revolution, it was necessary to devise a quick and efficient, easily understandable way of communication. France was surrounded by enemies, as well as burdened with riots within some cities. France's advantage was the lack of cooperation that the hostile allied forces had, because of the poor lines of communication. In 1790, Chape brothers began to devise a communication system that would allow information to be transmitted as soon as possible. The first tool set on March 2, 1791 was a combination of black-and-white panels, watches, telescopes, and codebooks. The first message, transmitted in this way, was: "If you succeed, you will soon bask in glory". The message was transferred between Brulon and Prce at a distance of 16km.

The word semaphore was first rinted in English in 1816.

radioactive dating, also known as  radioisotope dating  is a process that in  estimating the approximate  age  of  rocks. these data can be analyzed from  the studies dealing with the  decay of the radioactive elements that are present in these rocks. in nature, there are a few types of materials or atoms which are quite unstable and they spontaneously decay or breakdown to form other kinds of atoms.

the idealization of the rural landscape ; admiration for the beauty of nature ; focus on an individual's inner concerns