Source: James Smith,The
panorama of science and art; mbracing the sciences of aerostation,
agriculture and gardening, architecture, astronomy, chemistry ... the
arts of building, brewing, bleaching ... the methods of working in wood
and metal ... and a miscellaneous selection of interesting and useful
processes and experiments.
Liverpool, Printed for Nuttall, Fisher, and Co., 1815.,
(My own curiosity will keep me working on this entry. For the woodworker, the concept of "countersink" is simple, a merely a jig designed to allow you to set the head of a screw flush with the top of a piece. "Sink" I can understand. Why "counter"? Nothing that I have examined, so far, begins to explain the reason for counter in the term, countersink.)