A practical treatise on friction, lubrication, fats and oils; including the manufacture of lubricating oils, leather oils, paint oils, solid ... oils, and the application of lubricants

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 Excerpt: ...with will, for a time, appear to work equally as well as the good oil that was in use before. Cylinders and bearings, as well as the feeding cups, should be carefully cleaned before testing or using a new oil, if we wish to be able to judge correctly as to its quality. Objection is sometimes made by engineers to the stringy character of the " Valve-Oleum" oils, but this stringy nature, while perhaps somewhat inconvenient under careless handling, constitutes the very life of the oils, secures their uniform consistency in cold as well as in warm weather, and enables them to cling tenaciously to the metal, absorb the frictional heat as fast as it is generated by the motion, and permits their body to be of light enough character to vaporize rapidly into space with the heat they have absorbed. Unscrupulous parties, making imitations of the "Valve-Oleum" oils, use their stringy characteristics solely for the purpose of artificially thickening light and otherwise unsalable petroleum oils, but such mixtures do not stay together; they separate and are not neutral and contain free fatty acids, and are but little more efficient for lubricating than the cheap petroleum distillates. By the blotter test, the "Valve-Oleum" oils show their fatty characteristics by leaving permanent, translucent center spots on the paper; they show their uniform consistency by being slowly absorbed by the paper and spreading over it without separating, and they show their cleanliness by leaving no deposit of impurities on the paper. XIII. SOLID LUBRICANTS. GREASES. Solid lubricants consist principally of filtered stock or vaseline, and they are fed to the bearings through cups especially devised for that purpose, and furnished with screw pressure, or provided w...