Show I Why Rig Dig Guns Erode Prof IT U. M. M Rowe Howe draws daws attention to the fact tact that many points connected connect connect- ed with the tIle erosion of ot guns were renI rendered rendered ren ren- I dered deree Intelligible by y a cons consideration K J of the iron Iron carbon carbon diaphragm It has long been known that the Interior surfaces surfaces surfaces sur sur- faces of a gun became hardened on firing the effect being perceptible even after as ns few tew as five shots Professor Professor Professor Pro Pro- fessor Howe believes that this hardened hardened hardened hard hard- ened layer laer Is Js not due to carbonization tion of the metal but is merely a result result result re re- sult of heat treatment The liner Uner of at ofa ata a Inch 14 gun in un has been worn out by shots and therefore the total effective ef ef- effective t cUve working life Ufe of this gun guu was only n about out 34 seconds Scientific c American |