Use precise geolocation data and actively scan device characteristics for identification. This is done to store and access ...

Originally part of the Great North Wood, the park takes its name from the semaphore telegraph station that once stood on the hill in the early 19th century, used to relay messages between London ...

had built an optical/mechanical telegraph in 1791 and used it to send a message across ten miles in four minutes. Their invention was the basis for the semaphore systems — lines of towers ...