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Show The iielicgkai'SI is a recent invention inven-tion for transmitting messages where there arc no telegraph lines. It coa-eicta coa-eicta of a circul ar n:i:ror moving upon a joiut an.! supported on a tripod The orcr.it ;r. b- a ouick elevalio;) or depression of the gl.i:s, ;o as to catcii the full gl-ire cf tho sun is able to throw flahtS a instance of tventy-fivc mile?. The !c;:;;(h of the fliihe? correpponda with tiia'. of the dahts in the Mors? r.Iph-.b-by which ti:e mesaagea arc t;a::s!.itcI. Even nhere the clec'.ric telegraph exista, this method of Ctld telegraphy ia preferable pre-ferable to the oid way especially in war, as it dofs away With the dangers of wire-tipping and cutting by thp enemy, It was first brought into uae in war by the British in their recent operations on the A'ghan frontier, and performed r.i work eatis.'aciori'y. . The Spanish m.iitsiry i.uthcrilifi have adrpted the heliraph, and ether powers are consider m; the propriety Of making :t a art t!f their mi itiry Bystemi. |