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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.
This type of washer is especially effective as a lock washer when used with a soft substrate, such as aluminium or plastic, [8] and can resist rotation more than a plain washer on hard surfaces, as the tension between washer and the surface is applied over a much smaller area (the teeth). There are four types: internal, external, combination ...
Worn with a sallet to cover the jaw and throat (extending somewhat down the sternum). May also cover the back of the neck if worn with a bassinet rather than a sallet. May be solid or made of lames. Sometimes worn with a gorget. Gorget: Steel collar to protect the neck and cover the neck opening in a complete cuirass.
Originally made by Dowty Group, they are also known as Dowty seals or Dowty washers. [1] Now widely manufactured, they are available in a range of standard sizes and materials [ 2 ] [ 3 ] [ 4 ] A bonded seal consists of an outer annular ring of a hard material, typically steel, and an inner annular ring of an elastomeric material that acts as a ...
A modification introduced around 1859 reduced the distance between the grip and inside face of the knuckle guard from 2 + 3 ⁄ 4 inches (7.0 cm) to 2 + 3 ⁄ 8 inches (6.0 cm), narrowed the width of the guard where it met the pommel and inserted a washer between the guard and the grip. The top edge of the guard was also turned out slightly ...
Cylinder valves are usually machined from brass and finished with a protective and decorative layer of chrome plating. [2] A metal or plastic dip tube or valve snorkel screwed into the bottom of the valve extends into the cylinder to reduce the risk of liquid or particulate contaminants in the cylinder getting into the gas passages when the ...
An old-time practice, to the 18th century, was to add an accent on plaids or sometimes kilts in the form of a selvedge in herringbone weave at the edge, 1–3 inches (2.5–7.6 cm) wide, but still fitting into the colour pattern of the sett; [57] [58] a few modern weavers will still
A lathe of 1871, equipped with leadscrew and change gears for single-point screw-cutting A Brown & Sharpe single-spindle screw machine. Fasteners had become widespread involving concepts such as dowels and pins, wedging, mortises and tenons, dovetails, nailing (with or without clenching the nail ends), forge welding, and many kinds of binding with cord made of leather or fiber, using many ...
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