Show GUNS GUMS LINING LIMING QUICKLY WORN eroslow makes it necessary that it be replaced at Inte intervals ryals to insure accurate faring the life of a gun depends upon the progress of erosion which sooner or inters enters inter s certain bertal 1 to impair tile the ac accuracy curney of fire erosion la Is caused caused by the action af pf the explosive gases tit nt high temperature and pres aire the hat gases cause a thin alln of itce steel to absorb heat tho the film s pad sot set upon tho the release of the pressure it contracts which causes minute cracks that grow larger larder with kith every shot fired thus they forin folin passageways eways for mol molo mole e hot gas anil and that helln to enlarge all in still I 1 further tho the inner mil alice thug becomes rough boned and tile bore begins to corrode finally the bore bec pines so enlarged enlarge ed all eliat it it allows the g gases to es escape actipe tho the shell does not then acquire its it s proper rotation and its night becomes erratic allkins all guns except small ones arp are now constructed with linings in the tulio tube hichi which when the bore is worn out are removed ind and replaced by new onus ones the cost of rc re lining a gun guil Is approximately 30 3 per cent of the cost of the gun there tip appears pears to bo be no limit to the number of times that a gun can call be fellner the small arms used in this country coti eire ari considered to be worn out after to ro rounds binds have been bech fired small naval puns ginis can be fil felled ed about 1000 times before they are regarded as worn avorn out large r argo irgo 12 inch and 14 inch naval guns gulls tin cro considered to have a life on one lining of not more than low velocity buds such as howitzers howit an and mortars have correspondingly longer lives than ilian high velocity gelics of the sanie crill caliber ber because the pressure they develop find and hence the temperatures pera tures anro lower |