[2543]. Safety valve, with knife edge.
[2544]. Screw plug bottle stopper. (Codd’s patent.)
[2545]. Dished grating valve.
Section 90.—WATER WHEELS AND TURBINES.
(See also [p. 208].)
[2546]. Water-jet double turbine motor.
Section 91.—WHEELS IN SEGMENTS.
(See also [p. 212].)