When did they evolve from round to square?
This is from 1784.
Round is easy to make as a 3 oz ball is flattened according to “The Complete Dictionary of Arts and Sciences” from 1766.

It all changed in the Industrial Revolution when Samuel Critcherson invented a machine and it was advertised in The Massachusetts Register and United States Calendar for the Year of Our Lord 1852 
It went from round balls that were flattened to large sheets of dough that were cut into squares and pricked with a large cutter.


