9566. Sauvage, W. H. May 1, A.D. 1903, [date applied for under Patents Act, A.D. 1901]. Brakes, pneumatic-pressure. A valve for rendering inoperative the auxiliary brake cylinder such as that described in Specification No. 9308, A.D. 1904, consists of two check valves n, o surmounted by a spring piston p ; it is shown in the Figure in its inoperative position, as on an empty wagon. To cut in the auxiliary cylinder, the trainman, by means of a transverse spindle and a link s<1>, moves a rocker s, which depresses a plunger r and the piston q beneath it, so that the valve o is opened a little, and allows the auxiliary-reservoir air to pass through the connection c<1> and the ports o<3>, o<4> to the chamber above the piston q. This being depressed fully, the valves n, o are fully opened, so that the passage i<3>, i' connecting the main and auxiliary reservoir is opened. Crowns q<2> on the piston q, pressing against the packing-sheet p, prevent leakage round the valve stems from acting on the underside of the piston. A port p<2> removes the leakage of air which occurs with the parts in the position shown in Fig. 3. The condition of the apparatus may be ascertained and the auxiliary cylinder cut out by turning the cock u so that the bye-pass w discharges into the air.