Fenske Spiral
Fenske Spiral is made of metal wire to twist together, its contour is similar with the spring, so also called the triangle spring padding. It lies in with spring's difference circles is not round, but is the triangle. Between the circle and the circle triangle staggers certain angle, therefore, from the end face direction looked that is a polygonal. Fenske Spiral has a high efficiency, but compares with the ring, the resistance is bigger, mainly uses in the laboratory.
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