"the ceaseless clink of pattens"

The list of various noises includes the all too familiar 'clink' made by pattens, a type of metal contraption worn on the shoe to elevate it from the dirt of the street. 

Public DomainPattens - Credit: Jean Etienne Liotard

Pattens had come into use as far back as the middle ages, as a shoe for the outdoors worn over regular footwear. Initially made of wood or leather, by the time Austen is writing 'pattens' referred to a metallic addition to the bottom of the shoe, rather than the vertiginous contraptions pictured above. They were worn mainly by women in Austen's day, as male fashion included durable boots.