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  2. Bored cylindrical lock - Wikipedia

    en.wikipedia.org/wiki/Bored_cylindrical_lock

    Some commercially-sold doors may come prepared to receive one or more bored cylindrical locks, such as entry doors, which typically require both a door knob and dead bolt. [ 2 ] In the United States, typically, the face bore is sized from 1.5 to 2.125 inches (3.81 to 5.40 cm) in diameter and is centered at 2.375 or 2.75 inches (6.03 or 6.99 cm ...

  3. Deadbolt - Wikipedia

    en.wikipedia.org/wiki/Deadbolt

    A deadbolt or deadlock is a type of lock morticed into a wooden door where a bolt is thrown into the door frame, using a key from either side, to secure the door. [ 1 ] It is distinct from a spring bolt lock because a deadbolt can only be opened by a key or handle.

  4. Glossary of locksmithing terms - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_locksmithing_terms

    When the door is closed, the bolt extends into the hole in the strike plate and holds the door closed. The strike plate protects the jamb against friction from the bolt and increases security in the case of a jamb made of a softer material (such as wood) than the strike plate. Some strike plates have their hole size and placement calculated so ...

  5. Mortise lock - Wikipedia

    en.wikipedia.org/wiki/Mortise_lock

    Similarly, mortise locks were used in primary rooms in 1819 at Decatur House in Washington, DC while rim locks were used in closets and other secondary spaces. [3] Warded lock mechanisms are rarely used for mortise locks, owing to the physical depth required. The mortise locks used at Monticello were warded locks. [2]

  6. Madol Kurupawa - Wikipedia

    en.wikipedia.org/wiki/Madol_Kurupawa

    This distinctive structural arrangement occurs in medieval Sri Lankan buildings, where four pitch roofs have been provided. Rafters of the shorter sides are elbowed against the ridge plate and were held fast at its pinnacle by a timber boss known as madol kurupawa, which in turn attached to the end of the wall plate .

  7. Sri Lankan units of measurement - Wikipedia

    en.wikipedia.org/wiki/Sri_Lankan_units_of...

    A number of different units of measurement were used in Sri Lanka to measure quantities like length, mass and capacity from very ancient times. [1] Under the British Empire, imperial units became the official units of measurement [2] and remained so until Sri Lanka adopted the metric system in the 1970s. [3] [4]

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