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Bill Swayze, University of Waterloo engineering student who worked on the development of the Plumâ€" treeâ€" Rudin plastic pump. is seen here with prototype model being tested in UW lab. LABATT‘S: Across Canada Beer at its best Monday through Thursday: 10 a.m. to 6 p.m. Fridays: 10 a.m. to 9 p.m. Saturdays: 10 a.m. to 8 p.m. | RETAIL STORE _â€" (LZLabhatts SUMMER HOURS 155 King Street South WATERLOO _ To most North Americans a plain oldâ€"fashioned, handâ€" a ‘pretty humdrum item. But to millions of people in the ~â€"devéloping ~countries of the world it could be a godsend. It could someâ€" times mean the difference between life and death . . . an alternative to drinking filthy water from ponds and ditches, or an alternaâ€" tive to not having enough water. * What those countries need dayâ€"long use, and above all one that can be easily stand up under fixed if something does go searchers at the University of Waterloo have been workâ€" ing on the design of such a pump. They‘ve finished their task and prototype models aré currently being lab tested in England and field tested in a number of other countries. searchers have been Dr. Alan â€" Plumtree, of the department of mechanical engineering, and Dr. Aiâ€" fred Rudim, of the departâ€" ments of chemistry and chemical engineering. Dr. Joseph Tevaarwerk,. a lubriâ€" cations specialist in mechaâ€" nical engineering, _ also contributed. Plumtree and Rudin have been sponsored by the Inâ€" ternational _ Development Research Centre, a federal government _ organization interested â€" in _ fostering technological development (rather â€" than _ exporting Canadianâ€"made goods to developing countries). IDRC officials involved have inâ€" cluded David Henry and W. K. (Tim) Journey, who has been the creator of the Journey conceived it, is to be something that can be manufactured in the counâ€" tries that need it. . What Plumtree and Rudin have come up with is a plastic pump. â€" Whereas North _ American _ hand pumps have traditionally been made of cast iron, bronze, or some other metal, they chose plastic. This is because many of the developing countries have byâ€"passed the age of iron and steel completely in the process of developing their techonology; they‘ve gone right into the plastics age. They don‘t have steel plants or foundries, but they do ,A small group of ® x “. ‘.,.,‘ )A * veap ~#1" f 4* b N "B s # 2 B we: & af A «9. 19%. â€" ‘ 2 e 2s 7 â€"" weaÂ¥d f *# * § o4\ *4 se 4.1 5 ie o t o 3 , w 3 0 «LWBP _ Nee > . woll â€" ; 4 F $ » .,:.» ? i; tnt s \/% C. d' > 38 a & ; beâ€"a god send > , & * » 4 Wash cut and Blow Dry Wash cut and set ... Cut _ aoa e e es Children 2o e s two .principal â€"reâ€" $s reg. 20.00 Towers Plaza 82 Bridgeport Rd. 885â€"5720 \ We will please your needs for Spring HAIR FASHION FREDDY‘S UNISEX . by offering a perm special Mon. 10â€"5 Tues. Wed. 9â€"6 Thurs. & Fri. 9â€"8 Sat. 9â€"5 Acsk for Marie, Julie, Janice pump, â€" as 4 INOW *150° other The Rudin "reâ€" mfin-nv;:q: s with â€" h‘l':my ve ‘a comp new pump design!. * ! The most important feaâ€" ture of their design is a plastic piston that moves up and down inside a plasâ€" is inserted into: the ground, much as an automobile piston goes up and down in an engine cylinder. . One drills down into the ground to the water table, sinks the plastic casing (with, say, a threeâ€"inch interior â€"diameter) and inâ€" serts the piston into it. As the piston moves up and down the casing it lifts water (there is a check valve at the bottom of the pipe to hold the water that has been lifted by the pistâ€" on). In order to raise the water up there must be a good seal between piston and casing and this is acâ€" complished by the use of a piston ring, much like the piston rings in a car .. . . except that this ring is also of a plastic material. * ‘"Now the choice of plasâ€" tic for these rings is criticâ€" al," says Dr. Rudin, "beâ€" cause as the ring slides up and down there is bound to be wear, eventually. We want the ring to be the thing that wears out, and not the casing itself." _The Plumtreeâ€"Rudin deâ€" sign is such that periodicalâ€" ly, the piston can be removâ€" ed and the ring changed. The piston rings can simply be slices of polyethylene pipe, a material that seeps to be widely available all over the Wworld. wears to the point that the pump doesn‘t draw enough, you simply pull up the pisâ€" ton, cut a slice of a piece‘ of pipe to fit the casing, fit it onto the piston in place of the worn ring and lower the piston back down the casing,‘‘ says Dr. Rudin. It should be noted that the shape of the check valve at the bottom of the casing is ‘tdentical to that of the piston, except that it carâ€" ries an additional sealing ring. x Many of the piston and check valve parts are interâ€" changeable to minimize spare parts inventories. The check valve is seated in a polyethylene seal which (Continued on page 28) 7.00 6.50