{"version":"1.0","type":"link","title":"Semaphore line - Newikis","description":"A semaphore line is an installation used to send optical signals. It is also known as optical telegraph. Common system include signal towers with special installations on them or hand-held flags. The meaning of the signal is determined by the position of the elements, for example the flags. The…","provider_name":"Newikis","provider_url":"https://newikis.com","cache_age":86400,"thumbnail_url":"https://upload.wikimedia.org/wikipedia/commons/9/94/OptischerTelegraf.jpg","thumbnail_width":1200,"thumbnail_height":1600}