MICROFICHE REFERENCE LIBFUUW - Cd3wd.com

166present prototype size and cost, this water lifting method is too large andcostly for the low-acreage farmer in developing countries--although hecould probably benefit the rno;c from such a ‘I free” natural -energy pumpingmethod.This is not to say that water liftingadvancements should be retarded,but only that they should include small-user applications. Just asengineers at the turn of this century thought that no pump could outperformthe steam pump (see Section 1.2), the current level of pumping technologymust not be considered the last work. Advances such as the KROV pump(Keller, 1975) and the osmotic pump (Levenspiel and de Nevers, 1974)may eventually turn out to be among the commonplace water lifters of thefuture.