ENGINEERING 
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meters. 
621.2 Hydraulic engins or motors 
Industrial use of water as motiv power, including machines run by water 
under pressure produced by accumulators and also constructions and 
appliances for distributing and regulating supply of water to motors 
For hydraulic engineering (dam, breakwater, etc.) see 627; for pumps see 
621.6; for reservoirs, aqueducts, etc. see 628.1; for theory of mechanics of 
liquids see 532 
Water wheels 
Theory, classification, parts (e.g. paddles, vanes, buckets) water gates, cul- 
verts 
Overshot or bucket wheels Brest wheels 
Overshot wheels of low velocity 
Overshot wheels of high velocity 
Brest wheels Fairbairn wheels 
Sluice gate or Sagebien wheels 
Jndershot or impulse wheels and floating wheels 
Ordinary undershot wheels 
Wheels with curvd vanes or buckets Pelton wheel 
Vertical impulse wheels 
Current suspension wheels 
Floating wheels 
Turbins 
See also 621.165 Steam turbins 
General: parts (e.g. distributors, buckets, guide vanes) 
regulators 
Reaction or pressure turbins 
Outward flow 
Early forms: Barker’s mill 
Inward flow 
Downward flow 
Impulse or Girard turbins 
Water pressure engins Accumulators 
Hydraulic pumps 
Piping for high pressure 
Accumulators 
Hydraulic machinery and appliances 
For theory see 532.81 
Funicular engins Hydraulic tackle 
Hoists Elevators Cranes 
Class preferably in 621.86; i.e. purpose outweighs motiv power 
Special handling and lifting machinery for steel works, etc. 
Presses Forging and stamping machines 
Accessories: injection pumps 
Mining, tunneling and other hydraulic appliances 
Hydraulic giant, Brandt's hydraulic gun 
Hydraulic rams 
For theory see physics 532.83 
Lifting rams Montgolfier ram, Bolle ram, etc. 
Pumping rams Leblanc ram 
See also 621.64 Pumps 
274 Compressing rams Sommelier ram 
29 Flood gates Dams Mill sluices Hed and tail races 
Adaptation to hydraulic motors. For methods and principles of construc. 
tion see 627.8 Hvdraulic engineering