In the book "Lubricants" in popular form, the laws of friction and lubrication, the basic physical and chemical properties of lubricating oils, information about oils, greases, and rules for the application of oils and handling are described. The book is designed for drivers, technicians, mechanics and all those who have to deal with oils and greases. The longevity of any machine, be it an airplane, a tractor, a car, a walking excavator, a bulldozer, depends on the quality of the lubricating oi