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Industrial inspector wearing a thermoplastic hard hat in Cologne, Germany. A hard hat is a type of helmet predominantly used in hazardous environments such as industrial or construction sites to protect the head from injury due to falling objects (such as tools and debris), impact with other objects, and electric shock, as well as from rain.
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.
The use of the term dumdum for expanding bullets other than the early .303 designs is considered slang by most ammunition and ballistics sources. [ 15 ] [ 16 ] Manufacturers have many terms to describe the particular construction of the various types of expanding bullets, though most fall into the category of soft-point or hollow-point designs.
The usual meaning of diving helmet is a piece of diving equipment that encases the user's head and delivers breathing gas to the diver, but the term "diving helmet", or "cave diving helmet" may also refer to a safety helmet like a climbing helmet or caving helmet that covers the top and back of the head, but is not sealed.
Stovepipe was essentially a top hat made of stiff leather with painted design to identify fire company and provided no protection. [1] Leather was chosen as the preferred material both because it was what the man, Henry Gratacap, was familiar with, but also because thick treated leather was flame-resistant and highly resistant to breaking apart.
A deerstalker. A deerstalker is a type of cap that is typically worn in rural areas, often for hunting, especially deer stalking.Because of the cap's popular association with the fictional detective Sherlock Holmes, [1] it has become stereotypical headgear for a detective, especially in comical drawings or cartoons along with farcical plays and films.
It is essentially a .45 ACP case, necked down to .357, resulting in a cartridge similar in form to the earlier 7.65×21mm Parabellum and 7.63×25mm Mauser cartridges. It was created to be a low recoil target cartridge that would function reliably with multiple bullet types, FMJ to cast lead wadcutters without the feeding problems that straight walled pistol rounds sometimes exhibit. [2]
The design of these is based on cavalry helmets in common use since the 16th century, but with some features taken from the leather helmets. The version worn by the Prussian Gardes du Corps was of tombac (copper and zinc alloy) with silver mountings.
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