Show best lubricant for machinery where the press pressure Is heavy the lubricant should be thick in order to resist being squeezed out under tinder the load for light pressures oil should be used thus for n wagon heavy grease Is bet belt while for a cream separator of high speed a thin oil Is necessary in order that its viscosity will riot not add to the fi lotion friction solid substances in a finely divided state such as graphite tire are often used effectively to reduce friction this Is regarded as n good practice in handling tin the bearings pi of a windmill which can only be looked after occasionally |