INFORMATION CIRCULAR STUDIES ON THE HYDROGENATION OF COAL. III. TEST RESULTS USING VARIOUS CATALYSTS. V. ACTION OF CATALYSTS ON COAL PASTE

摘要

A study was made of the several proposed mechanisms of frictional resistance and the relation of these resistances to the physical properties of the stationary surfaces and the sliders. The influence of the apparatus components and atmospheric conditions upon frictional character¬istics was also investigated. Experimental data on the frictional resistance to motion over ice and snow presented by previous investigators as well as the data collected in this project were analyzed in terms of the studied mechanisms and properties.nIt was concluded that the resistance to motion over compacted snow and ice is principally a dry friction phenomenon relieved slightly by the presence of a film on the surface.