732 



Popular Science Monthly 



When encased in this body of steel the diver 

 can descend to great depths and work with safety 



A Steel Body with Arms and Legs 

 for the Diver 



A DIVING suit, recently devised for 

 deep-sea diving, is constructed of 

 steel to enable the diver to work at depths 

 of more than two hundred feet, at which 

 point the pressure is about eighty-eight 

 pounds to the square inch. One new fea- 

 ture of the suit illustrated is the position 

 of the arms, which are placed well forward 

 instead of in the usual 

 place at the sides. 

 This is supposed to 

 give him greater lift- 

 ing power when 

 weights are to be 

 raised above his head. 

 A telephone apparatus 

 within the suit keeps 

 the diver in communi- 

 cation with the surface 

 at all times. 



MOVABlt RUnPLATt 

 OPIMTLO BY SHOUlOtR 

 PRtSSURt 



PRtiSURt ON tRIP LCVtR 

 RtUAStS iAftn ROD 



One of the many safety devices for the 

 hammerless gun. It is not foolproof 



Safety First as Applied to the 

 Hammerless Gun 



AS usually made, the hammer- 

 . less gun has a little catch 

 on the tang which operates to 

 lock the triggers of the gun when 

 it is on the "safe" notch. Most 

 guns operate this automatically 

 as the top lever is pushed over. 

 But the catch merely locks the 

 triggers, and the gun can cheer- 

 fully jar off from a heavy fall, 

 sufficient to knock the strikers 

 out of notch with the internal 

 sears. 



Fine foreign guns have little 

 intercepting sears in addition to 

 the main sears, and these if not 

 deliberately put out of the way 

 by a pull on the trigger, reach 

 over and collar the hammer if it 

 falls from a jar. 



An American inventor has im- 

 proved an old British design by 

 locking the gun against firing 

 until it is both at the shoulder, 

 and is gripped by the right or 

 firing hand. A light rod runs 

 through the stock from a mov- 

 able butt-plate, which is pressed 

 in when the gun is put to the 

 shoulder, and releases a trigger 

 lock that puts itself on auto- 

 matically. Another lock is moved 

 by means of a light, easily moved 

 steel slip lying in the grip of 

 the gun. Until both of these locks are 

 moved, the gun cannot be fired. 



Locking the firing mechanism until pres- 

 sure is put on the butt of the gun is a 

 British scheme a quarter-century old, but 

 it is hardly worth its cost because if the 

 gun should fall, as out of a wagon, and hit 

 on the butt, it would unlock itself just in 

 time to fire from the jarring off of the sears 

 that usually follows a heavy blow on the butt 

 of any hammerless. Also, the gun can be 

 fired while resting on 

 the ground, and the 

 muzzle covered by the 

 hand of the shooter. 

 The combination grip 

 and butt safety would 

 guard against any such 

 accident, but the cost 

 of installation is 

 prohibitive. 



A gun is never really 

 safe until unloaded. 



/ 



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