ent-ly these twooperations aredone at thesame time, cut-ting tools shaving off the outside of the tube while the hog bit (Fig. 6) is taking its first and second boringcuts. The tube is very carefully turned and accuratelygauged for the reception of the jacket and hoops, which,after being as… … Fig. 9 -LATHES FOR BORING, TURNING AND CHAMBERING HEAVY GUNS, WASHINGTON. out; for if any portion of the jacket should become setbefore the entire jacket has reached its proper position,it would probably have to be turned off in the latheand be destroyed. The naval gun factory has thus farbeen very…
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