Hempel Quoins

Description

A type of quoin which uses two cast iron wedges having both a channel inside and teeth so that they would mainly move left and right, rather than in all directions, and so a cog-shaped key could be used to drive the quoins apart. These "Hempel quoins" use the same principles as the first wooden quoins and were still in widespread use at the turn of the 20th century.

Object Name(s): quoins

Object Category: TYPE COMPOSITION MACHINERY AND EQUIPMENT

Materials: metal
Material Part: body

Credit Line: National Print Museum, Dublin