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A portcullis (from Old French porte coleice 'sliding gate') is a heavy, vertically closing gate typically found in medieval fortifications. [1] A portcullis gate is constructed of a latticed grille , made of wood or metal or both, which slides down grooves inset within each jamb of the gateway.
A baby gate or stair gate is a protective barrier designed to prevent babies and toddlers from accessing areas of a home that may not be safe for them, such as stairways and kitchens. [2] Baby gates are typically constructed of metal, plastic and/or wood, and can be expanded to fit in a range of doorway widths. They may be designed for use ...
The first known example of a tumbler lock was found in the ruins of the Palace of Khorsabad built by king Sargon II (721–705 BC.) in Iraq. [1] Basic principles of the pin tumbler lock may date as far back as 2000 BC in Egypt; the lock consisted of a wooden post affixed to the door and a horizontal bolt that slid into the post.
A type of lock pick used to pick lever tumbler locks. Lever tumbler locks can be picked with a tool called a curtain pick which is inserted into the keyway of the lock, and a force is applied to the locking bolt. The pick is then used to lift each lever inside the lock to the correct height so that the locking bolt can pass.
Doors, gates, and other entrances, in particular, should be well lit to allow close observation of people entering and exiting. When lighting the grounds of a facility, widely distributed low-intensity lighting is generally superior to small patches of high-intensity lighting, because the latter can have a tendency to create blind spots for ...
David J. Marks is a woodworker living in Santa Rosa, California. [1] Marks studied art at Cabrillo College in Santa Cruz, California. In 1981, he opened a studio in Santa Rosa with his cat Liz and his young daughter. Through the 1980s, his focus was on one-of-a-kind furniture. Beginning in the 90s, he has moved toward wood turning and sculpture.