Solid and rolling friction and the laws and theory pertaining to same were also previously discussed, t being stated that there was no re laticnenip between—cohesion d viscosity. Factors affecting the vis-comity of lubricants were dealt with as were also the shearing stresses set up in plastic friction thus leading to consideration of the theory of lubrication as distinguished from solid friction which was the lecture ers subject last evening.
In this he pointed out that engineer seldom has to deal unlubricated surfaces and is chiefly concerned with the transference of energy and its possible application at some distant point with the minimum loss and showed how this involves the pressing together of relatively moving surfaces and their siding over each other at high velocities necessitating the keeping of same apart through the medium of a lubricant and so preventing, or rather minimizing wear and tear, power consumption, etc.
Examples illustrating losses by friction in steam engines and machines were given and showed clearly how the operating costs of an industrial plant can be influenced by lubrication.
Text read from the printed page and cleaned; old type leaves the occasional error.