Abstract: A hydrodynamic electrification system that generates electricity from water moving from a high side to a low side and around a structure that divides the low side from the high side generally includes a water transport system that directs the water from the high side presenting a hydraulic head, over the structure, and to the low side. The system includes a power extraction system having a wheel that receives the water from said water transport system and a mounting system having a high side anchor that connects near an intake to the water transport system at the high side and having a low side anchor that connects to the power extraction system at the low side.

Abstract: A drilling apparatus has a rotatable drilling rod (15) on the leading end of which is mounted a bit assembly including a bit (10) and a bit driver (12) for reciprocating the bit. The bit driver is powered by a high pressure fluid supplied from a fluid pressurizing apparatus interposed between the rod and bit assembly and including a device (16,18/114) for raising the pressure of fluid in a closed circuit into which said bit driver is connected, the said device being driven from a power source remote from it, for example, on the surface of the ground in which a hole is being drilled.

Abstract: A cutter pick assembly comprises a point attack cutter pick rotatably mounted in a pick box through a sleeve in a bore. In front of the sleeve a hardened metal thrust and seal ring is mounted surrounding the forward end of the pick shank. The ring has a front face which engages in a recess in a shoulder of the pick and the ring both supports the pick against rearwardly directed cutting forces and provides a sufficiently close fit with the pick and the pick box bore to limit passage into the bore of foreign matter that may interfere with rotation of the pick in use. The thrust ring is retained axially in the bore by a spring clip and a further spring clip holds the pick axially in the sleeve, the latter being trapped in the bore by the thrust ring.

Abstract: A cutter pick assembly comprises a point attack cutter pick rotatably mounted in a pick box through a sleeve in a bore. In front of the sleeve a hardened metal thrust and seal ring is mounted surrounding the forward end of the pick shank. The ring has a front face which engages in a recess in a shoulder of the pick and the ring both supports the pick against rearwardly directed cutting forces and provides a sufficiently close fit with the pick and the pick box bore to limit passage into the bore of foreign matter that may interfere with rotation of the pick in use. The thrust ring is retained axially in the bore by a spring clip and a further spring clip holds the pick axially in the sleeve, the latter being trapped in the bore by the thrust ring.