13,906. Cooley, W. I. June 19, A.D. 1903, [date applied for under Patents Act, A.D. 1901]. Annular-chamber type.-In the duplex engine shown in Figs. 2 and 3, the casing is in three parts, the middle portion being provided on each side with an annular groove, which, together with grooves in the two outer parts, constitutes the piston chambers. The steam supply to the ports k is governed by the slide valve actuated by the eccentric on the shaft. The piston flanges which are opposite to one another are provided with two lateral extensions or branches z which project into the deep channels c. The forward face of each piston flange is cam-like and presses back the slide 7 as it rotates, the rear face being abrupt. The slide 7 is kept pressed against the drum by a spring, and slides in a suitable slot. The cover 8 may be removed for examination purposes. The exhaust port of the piston chamber is indicated at m.
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