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The determination of the lubricity values of primary alcohols using a four-ball machine showed that except in the case of methanol, the values decrease with decreasing chain length. The lubricity values of the primary alcohols from ethanol to decanol are shown to vary inversely with their dielectric constants at similar temperatures. Some alcohols, namely butanol, pentanol and hexanol, give abnormal conjunction pressure versus load curves. These curves have been described as being 'saw-toothed.' Secondary propanol gives a 'saw-toothed' curve, while tertiary butanol gives a normal curve. The addition of 0.01% of secondary propanol to primary propanol gives a 'saw-toothed' curve. The lubricity value of distilled water was determined and was shown to be measurable. (Copyright (c) CSIR, 1987.)