Abstract: A roof drilling apparatus is provided for drilling a plurality of equally spaced holes in a mine roof. The apparatus includes a rotatable base upon which is mounted a drilling mechanism, thereby effecting a circular locus of travel to the drilling mechanism. Assuming equal angular separation between successive positions, the drilling mechanism may conveniently bore a multitude of equally distanced mine roof holes for accepting conventional roof bolts and supporting the roof without dislocative movement of the apparatus. The apparatus may be configured as a single or double unit or may be formed as an attachment to almost any conventional mining vehicle.

Abstract: Fluid-driven air-pumping and mixing apparatus for pumping air into a high methane environment and mixing ambient airborne impurities with such fluid for diluting the same. The apparatus includes a divergent mixing chamber proximate the outlet of the apparatus and a fluid dispersing nozzle having a configuration and location relative to the mixing chamber for maximizing air flow through the apparatus as well as providing a subsidiary advantage of increasing mixing of the driving fluid with the airborne impurities.