Abstract
The present investigation, by an improved tilt method, attempts accurately to determine the static coefficient of friction for metallic surfaces under varying surface conditions in different media. The presence and nature of oxide films materially affect the rise of the friction curve; a thin film acting as an abrasive causes the curve to rise, the rate depending on the normal force, until a layer of increased stability is reached. In terms of surface flow this indicates the formation of a vitreous layer. Thick films of certain oxides act as lubricants of great stability. Area of rubbing, shape of surfaces, and dry gases have no influence on $\ensuremath{\mu}$; moist inert gases show a capillary effect, moist active gases destroy the surfaces. $\ensuremath{\mu}$ is found to be a linear function of the number of slips of one surface over another.
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