LUBRICANT SPECIFICATIONS: PART SIX CUTTING OILS AND REFRIGERATOR OILS Available to Purchase

In a certain laboratory in which we spent a short time as an assistant chemist, many years ago now, it was an inflexible rule that any sample sufficiently fluid to be contained in a bottle should be tested for :— density, colour, viscosity, flashpoint and cold test, quite irrespective of its nature. An approach rather similar to that which prevailed in the treatment of the sick or injured of the army of that day ; firstly a number nine pill for common cold or broken leg.