A 1573 French piedfort produced using a split collar, with its edge lettering shown beneath
2.
Hocking suggested that this technique would have been less costly than the older method involving the split collar, because the steel strip could be replaced more economically.
3.
In the sixteenth century, the French engineer Aubin Olivier introduced to France the coin press, to which he added a split collar capable of creating edge lettering.
4.
When pedaling is reversed, the screw drives the clutch in the opposite direction, forcing it either between two brake shoes and pressing them against the brake mantle ( which is a steel liner within the hub shell ), or into a split collar and expanding it against the mantle.
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