Report issued by the Bureau of Mines discussing the mechanical equipment used in oil and gas wells of the Oklahoma City field. As stated in the introduction, "this paper presents the results of a study devoted chiefly to new equipment that has been developed to meet the requirements of drilling and producing operations in the Oklahoma City field and that has been accepted by drilling contractors and operators" (p. 1). This report includes tables, illustrations, and photographs.

From Scope of Report: "The subject matter in this bulletin is divided as follows: Theory of evaporation; methods of determining evaporation losses; lease operation; transportation and storage of crude petroleum; and evaporation losses of gasoline at the refineries."

Report discussing methods of sampling and estimation of ore deposits employed at a large number of mines and under a wide range of conditions in connection with the exploration and mining of ore deposits. Does not include methods employed in ore-dressing and metallurgical plants.