CHAPTER XVI.

ON WORK ON GUN BARRELS 140 Boring Gun Barrels 140 How to Make Cutters for Boring 141 Quick Boring Gun Barrels 141 Proving the Size During Boring 142 Draw Boring 142 Choke Boring 143 Choke Dressing 144 Barrels Most Suitable for Choke Boring 145 Freeing Gun Barrels 145 Another Method 146 Finishing Muzzles of Gun Barrels 147 Old Method of Straightening Barrels 148 The New Method 148 Another Method 153 Fitting Barrels Together 153 Joining Barrels Together 156 Soldering Barrels Together 157 Why Not Brase Barrels 158 Percussioning 159 Finishing Nipple Seat 161 The Vent in Percussion Guns 162 The Patent Breech 163 Form of the Chamber or Cup 164