"Friction, Lubrication and the Lubricants in Horology" by W. T. Lewis is a scientific publication written in the late 19th century. The work focuses on the critical aspects of lubrication in horological mechanisms, exploring various types of lubricants, their sources, refining methods, and the physics underlying friction and lubrication relevant to timekeeping devices. The opening of the text introduces key issues in the horology field, emphasizing the often overlooked but vital importance of proper lubrication for the longevity and accuracy of timepieces. Lewis outlines common failures stemming from inadequate lubrication and highlights the need for horologists to understand the physical principles governing these processes. He begins by discussing different types of lubricants used in horology, including oils sourced from marine mammals, and delves into modern refining techniques that enhance their effectiveness, setting the groundwork for more detailed explorations to come. (This is an automatically generated summary.)