Beehive coke ovens were called that because they were built in a beehive-like hemispherical shape, and then covered with earth. Cross section of a Hand-drawn Beehive Coke Oven. The Beehive Ovens were built in banks of ovens, called a battery, with a strong retaining wall in front, and then covered with earth.
One such technique is called âbumping.â Lock bumping, also referred to as key bumping is an attack technique using specially cut keys, known as bump keys, that can defeat conventional pin and tumbler door locks.
Scroll down for video. German engineers have revealed designs to make 3D-printed 'bump keys' (shown). These devices can be used to break into popular pin tumbler design locks. In a video a lock is opened by a bump key and a hammer in seconds. To make the key all that is needed is a picture of the lock and pin positions. Later this month at an event known as LockCon 2014 German engineer Christian Holler will present his and Jos Weyers' bump key design.