Stable belt uppermost as worn. Many of these belts are still worn by sub-units. These stable belts may still be worn by sub-units. Stable belt A stable belt is an item of uniform used in the armed forces of Denmark, the United Kingdom and other Commonwealth countries. Gymnastic belts are similar coloured belts used in Brazil and Lebanon. The stable belt originates from when cavalrymen would place the surcingle around the waist when cleaning the stables and tending to their horses. In the 1950s they spread to all branches of the armed forces, adding a splash of colour and individuality to the
Girth (geometry) width, with the same width "w". All curves of constant width have the same perimeter, the same value "w" as the circumference of a circle with that width (this is Barbier's theorem). Therefore, every surface of constant width is also a surface of constant girth: its girth in all directions is the same number "w". Hermann Minkowski proved, conversely, that every convex surface of constant girth is also a surface of constant width. For a prism or cylinder, its projection in the direction parallel to its axis is the same as its cross section, so in these cases the girth