This paper describes the application of a cable disc elevator to continuous lift ore vertically from underground mines. Application of this system requires the tensions developed within the cable must remain within the carrying capacity of the cable including applicable safety margins. A critical element occurs at starting the system when it is fully loaded which requires the force developed by the system to exceed the static friction forces.This paper describes the laboratory rig developed to investigate the static friction forces. Details of the results of tests on three different ores for both dry and wet conditions are given. These results are discussed.
He and least in tyt)e 6 filled with Ar. (Of course B can give no information about the absolute value of/3 for either cathode, since it is possible, indeed probable, that/3 may be comparable with t even for the K cathode.) It so happens that this is also the order of the L.F. time-lags estimated from either the frequency-response curves or the pendulum curves. We are not disposed to insist on this difference ; we mention it merely as suggestive of the direction in which further investigation might be fi'uitful.
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