Abstract: An explosion-proof fluorescent light fixture for use in hazardous environments, comprising a pair of fluorescent lamps each shielded by a protective globe and electrical contact containing end connectors at the opposed ends of the lamps and globes. The end connectors and globes form integral one-piece self-contained units and, in case of breakage or a globe, the entire unit of globe and end connectors can be easily detached and replaced simply the unloosening or re-fastening of bolts which normally secure the end connectors to the light fixture. The end connectors are provided with detachable end caps enabling a burned-out tube to be withdrawn and replaced.

Abstract: Improved methods and apparatus are provided for recovering high viscosity oils from a sub-surface earth formation utilizing horizontal well apparatus. A plurality of horizontal drill holes extend from a large diameter vertical shaft hole into the formation of interest. Steam may be injected into the formation through selectively placed conventional vertical wells terminating within the oil-bearing formation, while oil is recovered from the lateral drill holes. A noncondensible gas or cold water may be injected into the formation subsequent to steam injection to enhance the overall recovery of oil.

Abstract: Improved methods and apparatus are provided for recovering high viscosity oils from sub-surface earth formations. In particular, a large diameter shaft hole is employed and a plurality of substantially horizontal drill holes extend radially from the shaft hole into the formation. It is a feature of this invention to provide vertically spaced drill holes oriented to improve the recovery of the oil. Methods are provided for further enhancing oil recovery by coordinating the injected fluid with the location of injection within the formation.