New ... Of Coast Defense

rjuei . ! ! one cannon the our-!.: e .,ic. ;, ■, úülioved to bo more foriazi.'alilri i;::i;i the insido ir isa 12 inch fíim tnoneted ou ü:;i rawparte of the fort at Willet'8 Point, S. V . bat aroiiud il. h:ss beeu wonufl 13 miles of oue-half i;u-h insulntüd telegraph c;b!e. By tnoaua of Ëfaia ooi] and a yuaíiio tbe big gnu lir.s been traunforinetl iuto the most powerfnl elëctro-iunüinet i,j tlio world. 'i'liis nuique instraiaéiit was boni of ; mero experiment wtiini of Coloncl VV. K. Kiiig of the Cnited States eufcineer corps, but au astoniabing ncw feature in our coast deionse seems abont to bn evolved from tliis remarkablp combioation. This magnetiz ed gun, it lian been discovared, wil] derange a sbip's compass at a distance of six miles from the fort. Future developments ot' this chance born principie may yet evolve a valaable adjunct to the coast forts in the perfectiou of an electro-magnet which shall eventually prevent the possibility of a naval surprise under the oover of foe; or of ness. -