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A tubular lock and key. A tubular pin tumbler lock, also known as a circle pin tumbler lock, radial lock, or the trademark Ace lock popularized by manufacturer Chicago Lock Company since 1933, is a variety of pin tumbler lock in which a number of pins are arranged in a circular pattern, and the corresponding key is tubular or cylindrical in shape.
A common type of pin tumbler lock, of the euro cylinder type. The pin tumbler lock, also known as the Yale lock after the inventor of the modern version, is a lock mechanism that uses pins of varying lengths to prevent the lock from opening without the correct key.
Standard diving dress, also known as hard-hat or copper hat equipment, deep sea diving suit or heavy gear, is a type of diving suit that was formerly used for all relatively deep underwater work that required more than breath-hold duration, which included marine salvage, civil engineering, pearl shell diving and other commercial diving work, and similar naval diving applications.
To bump a lock, a person inserts a bump key into the key way one notch (pin) short of full insertion, then bumps the key inward to push it deeper into the key way. The specially designed teeth of the bump key transmit a slight impact to all of the key pins in the lock.
A full-face motorcycle helmet. A full face helmet covers the entire head, with a rear that covers the base of the skull, and a protective section over the front of the chin. Such helmets have an open cutout in a band across the eyes and nose, and often include a clear or tinted transparent plastic face shield, known as a visor, that generally ...
As a result, the mass of the helmet is increased to 2 kg. This helmet is designed for the personnel of the Russian armed forces. The helmet protects the head in class 1 (9×18mm Makarov pistol and revolver bullets), as well as from fragments of steel of spherical mass of 1.1 g (6.3 mm diameter of fragment) up to 400 m/s. [10]
While no ballistic helmet of the time could protect from small arms fire in close-quarters combat, it inspired the U.S. Army to create a new helmet to better protect special operations forces in direct action missions while providing the weight and modularity they desired that caused them to cease using the PASGT in the first place.
In 1847, the Household Cavalry, along with British dragoons and Dragoon Guards, adopted a helmet which was a hybrid between the Pickelhaube and the traditional dragoon helmet which it replaced. This "Albert Pattern" helmet was named after Prince Albert of Saxe-Coburg and Gotha who took a keen interest in military uniforms, and featured a ...