532^ Report of ti e Judges of Implements at Norwich. 
adjustment as regards its diameter in such a manner as that it 
can be distended equally at all parts of its surface from a 
diameter, less than or equal to that of the screen, to a diameter 
equal to it, as may be required. (1.) The wires of the screw 
and of the cradle alternate. (2.) The smallest mesh between 
the adjacent wires is existent when the screen^' and cradle are 
