Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . nsmitted, while witha wrought-iron shaft friction aljsorbs more tlian onefourth. When well lubricated, the loss is reducedto .005 and .09 respectively. The requisites of a good lubricant aie that itmust endure the heat even of melted liad, with-out change, in order to stand friction and lubricatethe cylinders of .steam-engines. (The heat under apressure of 150 p
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . nsmitted, while witha wrought-iron shaft friction aljsorbs more tlian onefourth. When well lubricated, the loss is reducedto .005 and .09 respectively. The requisites of a good lubricant aie that itmust endure the heat even of melted liad, with-out change, in order to stand friction and lubricatethe cylinders of .steam-engines. (The heat under apressure of 150 pounds of steam is enough to de-compose or distill and dry up most of the naturaloils in market.) They must be fixed and not vola-tile oils, as produced by destructive distillation,otherwise they are decomposed by friction, andburnt or dried up. They must not show or possessany acid reaction, either naturally or artilicially,otherwise the bolts are cut in the steam-chest, andthe iron, particularly wrought-iron, is made must possess a sufficient power of tenacitywithout oxidation, otherwise tliey will gum. The same laws are applicable to signal and burn-ing oil, for it makes no ditiereiice whether the oil is Fig. 30ia. Lozenge-Marhhif!. subject to immediate heat, as in a lamp or steam-cylinder, or whether it is slow and long continued,as in slides and other liearings, the cITect and resultare the same in the end upon the oil. eci-pes for the purposewe find: 1. PJaek-lead, 1 ; tallow 4. Mixand grind perfectlysmooth. Aild beeswax for railroad carriages. 2. (Booths.) Scotch soda, 1 pound ; boiling wa-ter, 2 gallons ; palm-oil or tallow, 10 pouixls. Agi-tate till the mixture is cooled to 65° Fall. LUBRICANT. 1361 LUBRICATOR. 3. (Maukettricks.) Caoutchouc dissolved in oilof turpentine, 4 pounds ; Scotch soda, 10 pounds ;glue, 1 pound ; dissolve in water, 10 gallons ; oil,10 gallons. Stir, ad<ling caoutcliouc last. 4. Rape-oil, 1 gallon ; caoutchouc (cut small), 3ounces
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