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2. Obi (sash) - Wikipedia

   en.wikipedia.org/wiki/Obi_(sash)

   Men's and women's obi were similar. At the beginning of the 17th century, both women and men wore a thin, ribbon-like obi. By the 1680s, the width of women's obi had already doubled from its original size. In the 1730s women's obi were about 25 centimetres (9.8 in) wide, and at the turn of the 19th century were as wide as 30 centimetres (12 in).

3. Belt problem - Wikipedia

   en.wikipedia.org/wiki/Belt_problem

   The belt problem. The belt problem is a mathematics problem which requires finding the length of a crossed belt that connects two circular pulleys with radius r 1 and r 2 whose centers are separated by a distance P. The solution of the belt problem requires trigonometry and the concepts of the bitangent line, the vertical angle, and congruent ...

4. Belt (mechanical) - Wikipedia

   en.wikipedia.org/wiki/Belt_(mechanical)

   An automotive belt with the number "740K6" or "6K740" indicates a belt 74 inches (190 cm) in length, 6 ribs wide, with a rib pitch of 9 ⁄ 64 of an inch (3.6 mm) (a standard thickness for a K series automotive belt would be 4.5mm). A metric equivalent would be usually indicated by "6PK1880" whereby 6 refers to the number of ribs, PK refers to ...

5. Slide rule - Wikipedia

   en.wikipedia.org/wiki/Slide_rule

   Some engineering students and engineers carried ten-inch slide rules in belt holsters, a common sight on campuses even into the mid-1970s. Until the advent of the pocket digital calculator, students also might keep a ten- or twenty-inch rule for precision work at home or the office [24] while carrying a five-inch pocket slide rule around with them.

6. Capstan equation - Wikipedia

   en.wikipedia.org/wiki/Capstan_equation

   The capstan equation [1] or belt friction equation, also known as Euler–Eytelwein formula [2] (after Leonhard Euler and Johann Albert Eytelwein), [3] relates the hold-force to the load-force if a flexible line is wound around a cylinder (a bollard, a winch or a capstan).

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