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In this investigation special mechanical apparatus was designed and built to measure and record the work done on a known weight of extruded material by any practical combination of auger, spacer, and die. Electric metering devices were modified to compensate for current difficult ies in the electric-power service and to measure accurately the power input to the auger machine. Means were devised to make comparisons between the workable characteristics of various clays and shales and fordoi:10.6028/jres.001.037 fatcat:mmznbxvk5fb6pj4doju5ajnz2u