Quoin (printing)

A quoin is a device used to lock printing type in a chase in letterpress printing.

[1] Quoins are pairs of wedges, facing opposite directions.

A wrench or quoin key forces them together.

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A single-page " forme " for printing the front page of the New Testament of the Christian Bible. The black frame surrounding it is the "chase", and the two objects each on the bottom and left side are the "quoins".