Abstract: A golf swing instruction aide adopted for attachment to the shaft of a golf club to measure or control the amount of wrist cock of the golfer during the golf swing. The aide includes first and second arcuate members one of which is adopted to be affixed to the shaft of a golf club and the other of which is movable to the first arcuate member and includes indicia to show the amount of relative movement and further includes apparatus to restrict relative movement to a desired amount.

Abstract: A lamp having at least a portion of a body formed of translucent material defining a hollow chamber within which a low light level light bulb is housed. A portion of the body is removable to provide easy access to the light bulb for removal and changing when required.

Abstract: A lamp having a body which defines a hollow chamber and is constructed at least in part from translucent material has one or more night lights directed upwardly and supported therein. The body includes a top crown which is held in place by a lock ring secured upon threads of a coupling device. Access to the upwardly directed night lights is obtained by removing the lock ring and moving the top crown upwardly to provide access to the hollow chamber so that one may insert his or her hand into the hollow chamber to remove and replace the lamp. The top crown is then replaced and the lock ring again secured.

Abstract: Isolation of native petroleum surfactants for lowering interfacial tensions in aqueous-alkaline systems. Petroleum of the type having reduced interfacial tension with water at high pH is subjected to fractionation by distillation including distillation under vacuum in the temperature range of 100.degree.-200.degree. C. to recover a surfactant fraction of the petroleum distilled in that temperature range. The fraction can be further concentrated by removing benzene-soluble components to obtain an ether-soluble residue having a density greater than water. The fraction alone, mixed with petroleum, or enriched with the residue, or the residue mixed with petroleum, can be injected as a slug into a subterranean oil reservoir to enhance tertiary recovery by alkaline water flooding. The amenability of a reservoir for alkaline flooding can be determined by separating the native surfactant fraction and measuring its interfacial tension with water at the proposed alkalinity of the floodwater.