A A are the eccentrics, B the slide-valve rod with guide G attached.
Here we have a slide-valve, with faces much wider than the steam ports.
In the valve-box is placed the slide-valve v to which is attached the spindle l.
The diagrams of this slide-valve would be difficult to understand.
Furthermore, the manipulation of the slide-valve may be interfered with if too much fuel is put in the generator.
The ports for egress or ingress are shown at X, the slide-valve at V, and the cylinder at C.
In Fig. 21 we have a cylinder and its slide-valve shown in section.
In the marine steam-engine is a steam-tight opening for the slide-valve rod to pass through.
Daniel Copeland was probably the first to adopt a slide-valve working with a lap to secure the expansion of steam.
In Fig. 24 we see in section the slide-valve, the ports of the cylinder, and part of the piston.