Patten (shoe) wooden inner sections with leather above and below. In earlier varieties of pattens, dating from the 12th century on, the stilt or wedge variety were more common. From the late 14th century, the flat variety became increasingly common. Leather pattens became fashionable in the 14th and 15th centuries, and in London appear to have begun to be worn as shoes over hose in the 15th century, spreading to a much wider section of the public. Most London patten soles were constructed of alder, willow or poplar woods. In 1390, the Diocese of York forbade clergy from wearing pattens and clogs
Mud Gas Separator a float-type mud gas separator by a float/valve configuration. The float opens and closes a valve on the mud return line to maintain the mud-leg level. According to pedestal or base type there are: Poor boy degassers are usually named according to the vessel diameter. Types include: The degasser type or configuration is typically customisable. The principle behind the mud gas separator is relatively simple. On the figure, the mud and gas mixture is fed at the inlet allowing it to impinge on a series of baffles designed to separate gas and mud. The free gas then is moved into