Show the rho life alf of big guns guna uth alth the invention of smokeless powder for use in the big guns of war ships and coas nHea a i problem presented itself to ordnance oid nance ofIl officers which was unknown to their pred pre decos ecoB mors ot of tho lays days of 0 blade black powder aal smoothbore smooth bore guns guna the problem la Is the prolongation of the life of the guns all modern artillery Is 1 silted that la Is each gun has a series of spit aprial at grooves cut on OIL its interior sin face the grooves impair t a spin to the projectile as it is forced bioni the gun ani and the effect la is to keep the point headed for ward liy by this means its range re ac curacy and penetration are enormous ly IY increased the gloat value of smokeless leaa powder la Is tho the increased velocity which it gives tu the alic lit 11 but velocity vilo city Is attil ned at the expense of a Iner increase case of temperature of the burning gases the high tern tem per pera ture in tin linn a 8 or burns burn 8 out the metal of the run gun itself so tint the lining lit at tile the breech bloech la Is soon the gun ahn inac bulale and cre us leg itie ithe war lepart mut of the united states liao has found that the big Is 13 inch glint run now mount ed in most ot of the seacoast Heni deafen sea aie quod for no nn mole moie that than CO 60 shots 81 ot beor they nie aie wom woin out the ex pense of the gun i la Is so BO great that this la Is a serious matter the striking bt foice of ilia iho projectile cannot bo be reduce without the of the hut ile it e war aar depa ment thinks it hr has tot found a way out of tho the dIf Leutty Stil stalking king force ja Is tho the prod net act of 0 the basli or ot 0 the pro jestila multiplied bv tile the spaced ith which it travels in anler oi ter to lengthen bengt ben the life of guis the pies pleasure sure mallch ancans incans speed must to ie reduced to maintain tho the sam bam ing foice accordingly th the mass of tho the shelf must bo b increased inci eased the war do de says youths companion Comp anlou la Is to substitute 16 15 or loinch 18 inch gung fur for the 13 inch guns row now in VP P la a tula way tho same ange end pono pone tl atlon will be preserved find and tho life of tle the guns guna ady advin kneed ped aiom fi orn GO CO to |