Keywords: Murray Shutter Telegraph 1795.png en A diagram of the six shutter telegraph invented by Lord George Murray in 1795 and used by the British Admiralty to communicate from London to the English coast from then until 1816 For more about this system see http //en wikipedia org/wiki/Semaphore_line U K and it's references From the article Lieutenant Watson's Telegraph Mechanics' Magazine No 222 published by Knight and Lacey London page 296 See http //books google com/books id rNZQAAAAYAAJ pg PA298 Touchup by myself in USA from screenshot in USA from Google books of this PD life + 70 artwork by unknown author in Mechanics' Magazine 1827-11-24 PD-old Mechanical semaphores |