Arcing Spring Diaphragms

Some articles on diaphragms, springs, arcing spring:

Diaphragm (contraceptive) - Types
... Diaphragms are available in diameters of 50mm to 105mm (about 2-4 inches) ... Diaphragms are also available with different types of springs in the rim ... An arcing spring folds into an arc shape when the sides are compressed ...

Famous quotes containing the word spring:

    Through winter-time we call on spring,
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    Declare that winter’s best of all;
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    Because the spring-time has not come....
    William Butler Yeats (1865–1939)