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When drawn across the full length of the door, it prevents the door or gate from being opened. To open the door or gate, the drawbar is pushed into a drawbar slot in the wall. These drawbar slots often survive in ruins and preserved buildings from that time. [3] [4] [5] The use of gunpowder and the possibility to blow up the door rendered them ...
Detectable tape or Underground warning tape is a conductive tape typically applied over buried utilities made of non-conductive materials such as plastic, fiberglass, or cement. It is used because most utility location methods work best on conductive objects, and hence may easily miss structures made of non-conductive materials.
Barbed tape or razor wire is a mesh of metal strips with sharp edges whose purpose is to prevent trespassing by humans. The term "razor wire", through long usage, has generally been used to describe barbed tape products. Razor wire is much sharper than the standard barbed wire; it is named after its appearance but is not razor sharp. The points ...
A fish tape (also called a draw wire, draw tape, or an electrician ' s snake) is a tool used by electricians to route new wiring through walls and electrical conduit. [ 1 ] Made of a narrow band of spring steel , by careful manipulation, the tape can be guided through confined spaces such as wall cavities or conduits in many countries.
Another type of doorstop is used to prevent doors from opening too far and damaging nearby walls. In this case a rubber cylinder or dome—or a rod or block of rubber-tipped metal, wood or plastic—is screwed into the wall, molding or the floor in the path of the door.
Double-sided tape is any pressure-sensitive tape that is coated with adhesive on both sides. [1] It is designed to stick two surfaces together, often in a way which is not visible in the end product, due to it being in between the objects rather than overlaying them. This allows for neater-looking projects and better craftsmanship.
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Double portcullis gates at Petersberg Citadel, Erfurt. Portcullises fortified the entrances to many medieval castles, securely closing them off during times of attack or siege. Every portcullis was mounted in vertical grooves in the walls of the castle and could be raised or lowered quickly by using chains or ropes attached to an internal winch ...
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