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2. Gun safe - Wikipedia

   en.wikipedia.org/wiki/Gun_safe

   An example (open and closed) of a typical gun safe. A gun safe is a safe designed for storing one or more firearms and/or ammunitions.Gun safes are primarily used to prevent access by unauthorized or unqualified persons (such as children), for burglary protection and, in more capable safes, to protect the contents from damage by flood, fire or other natural disasters.

3. Block and tackle - Wikipedia

   en.wikipedia.org/wiki/Block_and_tackle

   Diagram 3 shows three rope parts supporting the load W, which means the tension in the rope is W/3. Thus, the mechanical advantage is three-to-one. By adding a pulley to the fixed block of a gun tackle the direction of the pulling force is reversed though the mechanical advantage remains the same, Diagram 3a. This is an example of the Luff tackle.

4. Safe-cracking - Wikipedia

   en.wikipedia.org/wiki/Safe-cracking

   This pin can also be moved by the impact of the safe being dropped or struck while on its side, which allows the safe to be opened. [9] [10] [11] One security researcher taught his three-year-old son how to open most consumer gun safes. More expensive safes use a gear mechanism that is less susceptible to mechanical attacks.

5. Firearm malfunction - Wikipedia

   en.wikipedia.org/wiki/Firearm_malfunction

   A light primer strike will result in a dead trigger and the gun will not cycle. This malfunction is not to be mistaken with a squib load which the gunpowder is ignited and the bullet fires, but is trapped in the barrel of a gun. A light primer strike will not have expanding gases as a squib load would produce as sign that there is one.

6. Recoil operation - Wikipedia

   en.wikipedia.org/wiki/Recoil_operation

   Block diagram of inertia operation cycle, see diagram key above. As the recoil spring returns to its uncompressed state, it pushes the bolt body backward with sufficient force to cycle the action. The bolt body unlocks and retracts the bolt head, extracts and ejects the cartridge, cocks the hammer, and compresses the return spring.

7. Simeon North - Wikipedia

   en.wikipedia.org/wiki/Simeon_North

   Simeon North. Simeon North (July 13, 1765 – August 25, 1852) was an American gun manufacturer, who developed one of America's first milling machines (possibly the very first) in 1818 and played an important role in the development of interchangeable parts manufacturing. North was born in Berlin, Connecticut, into a prosperous family able to ...