NOVELTY - Bore hole pump (10) comprises an accumulation chamber (14) with reopenably closable accumulation chamber charging non-return valve (16), and a transfer chamber in reopenably closable flow communication at its inlet end with the accumulation chamber via reopenably closable accumulation to transfer chamber non-return valves (20) while, at least once so ready for use, presenting its outlet at a high elevation.    USE - For use in liquid transferring installations for transferring liquid from a source of accumulation to a high elevation discharge (claimed), particularly for pumping water from a bore hole.    ADVANTAGE - The gravitational force exerted by water being pumped is exerted on the non-return ball type valves that is not prone to the kind of wear associated with seals. The ingress of particulate matter to the lift cylinder is limited, thus limiting the amount of maintenance on the pump.    DETAILED DESCRIPTION - Bore hole pump comprises an accumulation chamber fitted with reopenably closable accumulation chamber charging non-return valve, and a transfer chamber in reopenably closable flow communication at its inlet end with the accumulation chamber via reopenably closable accumulation to transfer chamber non-return valve while, at least once so ready for use, presenting its outlet at a high elevation. The equipment, at least once ready for use, causes a cyclical variation in the volumetric capacity of the accumulation chamber in response to the operation of drive source to which the equipment is connected, while the accumulation chamber charging non-return valve is constituted to close off the flow of liquid to the accumulation chamber and the accumulation to transfer chamber non-return valve is arranged to open up the flow of liquid to the transfer chamber during the part of the cycle in which the volumetric capacity of the accumulation chamber becomes reduced or vice versa during the part of the cycle in which the volumetric capacity of the accumulation chamber becomes expanded thus causing the stepwise transfer of liquid up the transfer chamber and its discharge from the outlet of the transfer chamber.    INDEPENDENT CLAIMS are also included for:    (a) method of transferring liquid from a source of accumulation to a high elevation discharge, comprising, in a cyclical routine, causing liquid from the source to accumulate in an accumulation chamber in response to an opening of the flow connection between the source and the accumulation chamber followed by the transfer of at least part of the accumulated liquid up a transfer chamber in response to a chamber size expandable reduction, if not a full diminishment, of the volumetric capacity of the accumulation chamber once the flow connection between the accumulation chamber and the source has been closed off and the flow connection between the accumulation chamber and the transfer chamber, that is closed during the step of accumulation in the chamber, has been opened, resulting in liquid stepwise becoming pushed up the transfer chamber during each of the accumulation chamber volumetric reduction phases of the routine and thus discharged from its discharge end; and    (b) liquid transferring installation comprising the above equipment installed down a bore hole and inclusive of outer sleeve along which the transfer tube is reciprocatably operable in response to being drivingly connected to the drive mechanism of windmill.    DESCRIPTION OF DRAWING(S) - The figure shows in sectioned side elevation a liquid transferring equipment in the form of reciprocating bore hole pump as installed in a bore hole.    Bore hole pump (10)    Collecting cylinder (12)    Accumulation chamber charging non-return valve (16)    Transfer chamber non-return valve (20)    Lift cylinder (22)    Transfer tube (30)    Accumulation chamber charging non-return valve carrier (42)