Abstract: A drilling method and apparatus for directional drilling of a borehole. The apparatus includes a retrievably mounted downhole monitor for sensing parameters of the drill rod to which a drill bit is attached. A bent-sub is connected with said drill rod behind the drill bit to position the drill bit to extend angularly with respect to the drill rod. An actuator such as a hydraulic ram is provided for exerting thrust along the axis of the drill rod on said drill bit. The drill rod and drill bit is not rotated with the use of a downhole motor. Based upon the signals received from the downhole monitor, the drill rod and bit are pulsed to effect the desired trajectory of the drilling.

Abstract: A variable discharge grille assembly is arranged in an air discharge opening of a room air conditioner. The assembly includes a frame surrounding the air discharge opening and a louvered air deflecting grille arranged in the frame. The louvered air deflecting grille is pivotally supported on the air discharge opening frame, and a built-in stop feature keeps the grille from coming out of the frame during operation. The position variations of the air deflecting grille relative to the air discharge opening frame is accomplished by a rachet arrangement that includes a yieldable finger on the grille which snaps into detents formed on the frame surrounding the air discharge opening.

Abstract: Respirable dust particles in air are reduced by spraying with water from high pressure spray nozzles. The removal of particles in the size range most likely to cause pathological damage is enhanced by addition of a surfactant to the spray water.