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Knight's Mechanical Encyclopedia (ed. Knight), W. (search)
causing the throw of the valve, which is cushioned by annular watercham-bers p p at each end of the piston. In a third modi fication, the valve is shifted by a weighted forked lever partially embracing it and connected with the sliding rod. Spencer's piston water-meter. The Despers watermeter has two connected pistons, a valve, and registering-pinion. In Spencer's (Fig. 7116), two measuringchambers f g act alternately to receive and discharge the water The case containing the operaSpencer's (Fig. 7116), two measuringchambers f g act alternately to receive and discharge the water The case containing the operating parts is tight, and is so constructed as to form the heads of the cylinders, whereby stuffingboxes are dispensed with The pistons are connected to the cranks of the shaft of the eccentrics, which operate the slide-valves through the medium of connecting-rods n n See also Fig. 2974, page 1328. Class 5. The meter-wheel. Hargrave's meter (Fig. 7117) has two chambers B C which are alternately tilted to be filled with water from the induction-pipe G G. The water flows in turn through the pip
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