Patten (shoe) dung and human effluent (from chamber pots)– was usually thrown directly into the street (often with minimal advance warning). Making full foot contact with such an unpleasant surface was, understandably, highly undesirable. Thus, pattens tended to only make contact with the ground through two or three strips of wood and raised the wearer up considerably, sometimes by four inches (ten centimetres) or more in contrast to clogs which usually have a low, flat-bottomed sole integral to the shoe. A later pattern of patten which seems to date from the 17th century, and then became the most common, had a flat
Bucket-wheel excavator they are now capable of operating. Many BWEs have been designed to operate in climates with temperatures as low as . Developers are now moving their focus toward automation and the use of electrical power. A bucket wheel excavator (BWE) consists of a superstructure to which several more components are fixed. The bucket wheel from which the machines get their name is a large, round wheel with a configuration of scoops which is fixed to a boom and is capable of rotating. Material picked up by the cutting wheel is transferred back along the boom. In early cell-type bucket wheels,